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Klassikstiftung Graphiksammlung MSI Workshop in Weimar - Annette T. Keller

Klassikstiftung Graphiksammlung

MSI Workshop in Weimar

I am very pleased to be installing the multi- and narrow-band MSI system with my colleagues in Weimar and to examine its potential in terms of integration into scientific analysis in a workshop in three days. In particular, the narrow band method can be embedded very well into the scientific point-based analyzes that have previously been used on site, such as Raman, XRF, FORS etc., and the gap is closed by the spectral representation of the narrow band image data and the statistical analyzes within the Rainbow software between “looking” and “measuring”. Together we agreed in advance on reference materials for evaluating the data and agreed that the reference set shown in the picture above was created with the help of our colleagues in Weimar.

Uni Torino & Biblioteca Nazionale MSI Multiband Workshop - Annette T. Keller

Uni Torino & Biblioteca Nazionale

MSI Multiband Workshop

Over three days we worked together on drawings and palimpsests to become familiarwith the new multispectral system and to learn about its possibilities and limits. This also included a theoretical introduction to multispectral photography in order to better understand the connections.

Emmaus monastry in Prague Project Deutsche Bundesstiftung Umwelt - Annette T. Keller

Emmaus monastry in Prague

Project Deutsche Bundesstiftung Umwelt

For the first time, I used Phase One's non-invasive Rainbow Multispectral Imaging System in a larger campaign on a wall painting object with a specially developed tripod solution. Up to 20 high-resolution image series, so-called stacks/vault field in the highest resolution (150MP) between approx. 350nm and 1000nm, provide information on the organic and inorganic materials used such as pigments and binders, on interventions such as overpainting and other changes. We (Katharina Stellbach and I) examined 5 vault fields in Multi- and Narrow Band MSI in two and a half weeks. The data is now available to Prof. Lenz from the Academy of Fine Arts in Stuttgart and the entire team.

Here is a contribution from Czech television about my work on site.

Further information about the project (source TH Cologne):

The Emmaus Monastery in Prague's New Town impresses with an outstanding cycle of Gothic wall paintings from the 14th century. But advancing time and environmental influences threaten the masterpieces. A team from the Institute for Restoration and Conservation Science is therefore developing a conservation concept with German and Czech partners. “The cloister of the monastery has wall paintings on 22 vaulted areas that stand out for their complexity and artistic quality as well as the historical context of the time of Emperor Charles IV. Depictions from the Old and New Testaments in a similar way are rare in Central Europe,” says project leader Prof. Adrian Heritage, describing the research subject. In addition to natural aging, environmental influences such as salts, microbiological infestation and atmospheric pollution as well as the effects of the Second World War put a strain on the images. In addition, some of these were painted over, covered and exposed again several times.

Symposium for the Study of Underdrawing and Technology in Painting in Leuven- Annette T. Keller

XXIII Symposium in Leuven

For the Study of Underdrawing and Technology in Painting

Once again an interesting exchange between colleagues, both on the subject of imaging and art historical topics. I was very happy to meet familiar people from the community. Thanks to Bruno Vandermeulen and Hendrik Hameeuw, there was a slot in the library in which Gerald Schnittger (Phase One) and I were able to talk about the automatic MSI multi and narrow band system that I helped develop, both from a technical perspective and user-specific issues.

Museo Nacional del Prado MSI Rainbow Introduction - Annette T. Keller

Museo Nacional del Prado

MSI Rainbow Introduction

The Museo Nacional del Prado has chosen a Phase One Rainbow Multi- and Narrow Band and will integrate this into a modified robotic system that will allow very large paintings to be “traversed” and stitched. Over two days, I worked through the hardware and software functions together with Ana Gonzalez and her colleague in order to familiarize the users with the system.

La Veneria in Turin MSI Rainbow testing - Annette T. Keller

La Veneria in Turin

MSI Rainbow testing

In order to give my colleagues at the Fondazione Centro Conservazione e Restauro “La Veneria Reale” in Turin the opportunity to test their complex objects, we will spend the first day together to ensure that the full potential of the system can be used. I am very excited about their experiences and the subsequent exchange about the results. In a facility like this, such a system is extremely interesting as the first analytical instrument in the chain of various procedures and the connection of images, image data, i.e. quantitative information, to other scientific methods is very helpful.

SLUB MSI workshop Fungal infestation of paper objects - Annette T. Keller

SLUB MSI workshop

Fungal infestation of paper objects

In this two-day workshop at Sächsischen Landesbibliothek – Staats- und Universitätsbibliothek in Dresden, I will work intensively with the photographer and restorers/conservators, i.e. in an interdisciplinary manner, on the question of the possibilities of recording and differentiating fungal infestation on paper objects. These conservation-specific questions will guide us on both days. On the second day we will evaluate the multi- and narrow-band image stacks together, modify them if necessary and discuss their potential results.

Rijksmuseum Amsterdam MSI Rainbow - Annette T. Keller

Rijksmuseum

MSI Rainbow

At the Rijksmuseum I supported Phase One in testing Rainbow Multispectral Imaging and its possibilities and benefits with a short lecture. Together with Gerald Schnittger (Product Manager Phase One), we gave an insight into the sophisticated technology and the benefits of multispectral image data and its evaluation.

Dyes in history&archeology Copenhagen- Annette T. Keller

Dyes in history&archeology

Conference in Copenhagen

Multispectral images in multiband & narrowband, which were taken in Vienna, were presented as part of the presentation Practical dyeing and technical imaging. The identification of cochineal dye and dyeing methods used to produce a Mesoamerican feather insignia shown in the session Dyeing – but not textiles during the conference. In her contribution, Renée Riedler shows the joint work of Renée Riedler, Julia Zeindl, Maria Olvido Moreno Guzmán, Nikoletta Sárfi, Martina Griesser, Leticia Arroyo Ortiz and me. A very nice example of interdisciplinary work by natural scientists, restorers, technicians, etc. I am happy to be part of this research and thank Renée for the presentation.

More information about the project and beautiful object

MSI Rainbow in Leek (UK) Latest technology in multispectral imaging - Annette T. Keller

MSI Rainbow in Leek (UK)

Latest technology in multispectral imaging

Together with colleagues from various libraries in central and northern England, we had the opportunity to test the potential and the latest technical developments of the Phase One Rainbow system and discuss the results. The latest generation of LED lighting was used and the immense advantages quickly became apparent. The qualitatively and quantitatively recorded image data can already be statistically analyzed within the recording software and enable initial impressive results in terms of readability of texts and/or grouping of materials via PCA (principal component analysis), ICA (independent component analysis) and K-means Cluster.

British Library MSI Rainbow in London - Annette T. Keller

British Library

MSI Rainbow in action in London

I spent three days with colleagues from London and the UK and we discussed the potential of the Phase One Rainbow MSI system. We were able to take a closer look at interesting objects from the British Library collection. Both manuscripts, palimpsests and Egyptian paintings on stone. The results were convincing, which we were able to capture with the only system to date that provides both multiband and narrow band, i.e. qualitative and quantitative information. Copyright Foto: Peter Mallet

Convent of St. John Workshop Multiband Imaging in Müstair - Annette T. Keller

Convent of St. John

Workshop Multiband Imaging in Müstair

Once again I visited the Müstair Monastery and this time was invited to hold a workshop on multispectral imaging in 3 days. The very good exchange with restorer Rufino Emmenegger and the first series of captured MSI images already showed previously unknown results in the excerpts we observed. I am very pleased to be able to support him so that he can use this technology in the future if necessary.

Roman grave (Köln) MSI test phase - Annette T. Keller

Roman grave Weiden (Köln)

MSI test phase

In a first phase, I examined the Roman grave, which was discovered during excavation work in 1843, to see whether results can be expected using multispectral imaging systems such as multiband and narrow band. Together with representatives of the city of Cologne, we have now decided to subject the Roman grave complex, which is one of the best preserved and most impressive north of the Alps, to a thorough imaging analysis in January, as initial observations provide clues that could lead to interesting results.

Lecturedship at the ABK Stuttgart - Annette T. Keller

Lecturedship at the ABK Stuttgart

4 days of non-invasive examination methods in theory and practice

It is now the fourth seminar at the Staatlichen Akademie der Bildenden Künste in Stuttgart, initiated by Prof. Roland Lenz. This time, however, supplemented by the non-invasive mobile measurement methods XRF, Raman and Near Infrared by Judit Zoeldfoeldi from the MPA Stuttgart. We were able to discuss various questions on a wide variety of objects, from wall painting fragments to glass and paper objects, starting with multi-band imaging and narrow-band data acquisition to point-by-point measurement methods. Thank you for letting me be part of the team again.

Germanisches Museum Nuremberg Graphics Collection & MSI MB & NB - Annette T. Keller

Germanisches Museum Nuremberg

Graphics Collection & MSI MB & NB

We spent a day together in the dark demoing the Phase One Rainbow MSI system. Both the head of the graphic collection and the head of the Institute for Art Technology and Conservation, as well as participants from different departments, made various graphic works available, from Dürer to van Eyck to Beckmann. Over the two days we discussed the results and the possibilities of the non-invasive diagnostic procedure on polychrome and monochrome works. Exciting exchange, many thanks!

Restauro Salone Internazionale dei Beni Culturali e Ambientali - Annette T. Keller

Restauro

Salone Internazionale dei Beni Culturali e Ambientali

From 10th to 12th of May 1st, I attended the "Fiera" in Ferrara to exchange ideas with colleagues and to hear technical papers that are particularly relevant to my activity. As always, exciting program and a good meeting among colleagues.

La Veneria Reale Centro Conservazione Restauro, Torino - Annette T. Keller

La Veneria Reale

Centro Conservazione Restauro, Torino

Together with photographers, scientists, restorers, including colleagues from the Opificio, we tested the possibilities of multiband & narrow band imaging at the highest resolution of 150MP. Among other things, we examined an object from the Egyptian Museum in Turin and were able to show Egyptian blue and its distribution, as well as the pigment in a spectral representation between 365nm and 940nm. In a second appointment we will further discuss the results of the different objects.

Maritime Museum Amsterdam Rainbow Multiband & Narrow Band Discussion  - Annette T. Keller

Maritime Museum Amsterdam

Rainbow Multiband & Narrow Band Discussion

About 20 participants from different museums and institutions, even from Belgium, came to the Maritime Museum, Phase One user, on this day for this exchange on multispectral photography and its potential in multiband and narrow band. Based on a wide variety of objects, paintings from the 16th-17th. Century, manuscripts etc. we discussed painting techniques, materials, retouching, pigment distribution, legibility and much more. Here, too, the step from the visual evaluation to the evaluation of image data in the form of spectral curve representation and statistical analyzes to restore the readability of texts was relevant.

22° Coloquio Del Seminario de Estudio y Conservación del Patrimonio Cultural, 18.-19.5.  - Annette T. Keller

22° Coloquio

Del Seminario de Estudio y Conservación del Patrimonio Cultural, 18.-19.5.

I would like to point out this interesting post that I linked below. It is the famous Quetzalfeather-headdress of the Aztecs from Mexico, a unique artefact, now in the Weltmuseum in Vienna. It is the last known specimen of its kind worldwide and is therefore of particular relevance as a World Heritage Site. The item is controversial, and it remains unclear how and when it left Mexico (read more on the Weltmuseum Wien website). The multispectral imaging on this object has been made during two demo days at the Weltmusuem in Vienna and I then continued the discussion on Cocciniglia with Ms Renée Riedler, curator at the Weltmuseum Wien. Just take a look, very exciting.

Link

Supsi MSI Workshop in Mendrisio - Annette T. Keller

Supsi MSI Workshop

in Mendrisio

When I visited the Supsi, with Francesca Pique, a colleague for a long time, from the joint project "Organic Materials in Wallpaintings" and her colleagues, as well as students, we finally managed to work together with the Rainbow MSI system in one day and beginning to discuss the results due to the shortness of time. We took a closer look at the color charts and objects of the students. We will do the evaluation online or on site shortly.

Herzog Anton Ulrich Museum Painting examination with Rainbow Multiband & Narrow Band - Annette T. Keller

Herzog Anton Ulrich Museum

Painting examination with Rainbow Multiband & Narrow Band

In Braunschweig, on behalf of Verena Herwig, the head of the restoration department and head of painting restoration, as well as the radiation protection officer, I examined a painting that is relevant to an exhibition planned for this year. This time I had the opportunity to see also the 3D digital X-ray technology and its results. This shows once again that radiation diagnostics, from multispectral imaging to X-rays or gamma rays, are playing an increasingly relevant role in the examination of works of art.

Musée des Beaux-Arts de Dijon Rainbow Multiband & Narrow Band Testing - Annette T. Keller

Forensic MSI demo at the Zurich Police and Justice Center

Rainbow Multiband & Narrow Band

The on-site installation of the Phase One Rainbow System gave forensics professionals the opportunity to test the potential of results on their objects that would otherwise not be permitted to leave the premises. The interdisciplinary nature of the department raises a wide variety of questions. The result should be as non-invasive as possible, in order to preserve the “original”. The automated MSI system can be adjusted according to each question through the individual use of the individual components through reflection and luminescence images and can also be used completely manually, this makes it unique for this kind of application.

Musée des Beaux-Arts de Dijon Rainbow Multiband & Narrow Band Testing - Annette T. Keller

Musée des Beaux-Arts de Dijon

Rainbow Multiband & Narrow Band Testing

At the museum depot of the Musée des Beaux-Arts de Dijon, I helped Phase One apply the automated multispectral imaging system Rainbow. My task: to show the benefits of the results on the objects. Photographer and restorers provided various works of art from different epochs and we also discussed the use in both vertical and horizontal positions. We will catch up on the complete results in a team meeting in order to get the best yield from the generated image data. It is just as much about aspects of painting technique such as underdrawing, etc. as it is about material-specific aspects (pigments, binders, retouching), which can be classified through the spectral representation of the materials.

SMK Copenhagen Set up multiband and narrow band workflow in vertical & horizontal orientation - Annette T. Keller

SMK Copenhagen

Set up multiband and narrow band workflow in vertical & horizontal orientation

In a 2-day workshop I set up the full Phase One Rainbow System with Loa Ludvigsen for dual use in vertical & horizontal position. Together we performed the calibrations for focussing, alignment, flat field & exposure compensation and positioned the geometry of the hardware. The result: a faster switch between both positions by changing the camera and thus use for drawings and small objects, as well as paintings of larger formats that have to be stitched. A precise and individual light setting still plays a decisive role in order to avoid reflections, especially in UV reflection. The results: In addition to the visual abnormalities, spectral properties can be defined in 16 points and thus combine imaging with scientific analysis.

Universität Hamburg Centre for the study of manuscript cultures  - Annette T. Keller

University of Hamburg

Centre for he study of manuscript cultures

With the two imaging experts Kyle Huskin and Ivan Shevchuk we took the opportunity to discuss three days different issues related to manuscripts and polychrome objects and to talk about multispectral imaging solutions. This time we made the recordings with the Rainbow MSI system. Many thanks for the exciting days and the open exchange with colleagues.

Munch Museum Oslo, libraries and forensics - Annette T. Keller

At The Munch Museum Oslo

with Norwegian colleagues from museums, libraries and forensics

In freezing temperatures, bright sunshine and a fantastic view of the opera house and the bay from the photo studio of the Munch Museum, I discussed the possibilities of the Rainbow MSI system and specific applications with the participants from all over Norway, mostly in the dark. During these two days we examined an Edward Munch painting and were able to very quickly assign cadmium pigments to the UV-induced infrared luminescence images. The questions asked by the forensic scientists were somewhat different. Here it was of particular interest to make residues on textiles visible. This was achieved very quickly using the statistical analysis tools integrated into the software, and the narrow band recordings provided clear results. The exchange between cultural heritage and forensic experts was very fruitful for everyone involved. At the end, of course, a visit through the collection was a must.

Interdisciplinary research project Piranesi database online - Annette T. Keller

Piranesi Database Online

Interdisciplinary research project

Piranesi, one of the most famous Italian etchers and architects. As part of the interdisciplinary research on the works from Piranesi's Bottega, I analyzed two albums with almost 300 drawings using multispectral imaging. In 2014 the albums were accidentally discovered by the art historian Georg Kabierske in the archive of the Kunsthalle Karlsruhe. On Friday, February 10th the Piranesi database has now been presented to the press.

Phase One MSI & CH Development Workshop - Annette T. Keller

Phase One MSI & CH Development Workshop

Strategy and Development in 2023

In a three days workshop I discussed with my Phase One colleagues specifics for the implementation of further development stages in the field of multispectral imaging for cultural heritage and forensics. For the year 2023, the focus will also be on the generally digitization of 2D and 3D objects.

Forensic Photography Symposium - Annette T. Keller

Forensic Photography Symposium

4 days workshop

Forensic Photography Symposium is the first global virtual gathering of its kind for forensic photography. It is a perfect platform to echange knowledge and information. Photographers from the field of forensics, academics, technology companies and software developers discuss ideas and solutions to problems together. Multispectral photography also plays a major role here.

MSI exchange in the Leuven library - Annette T. Keller

Leuven & Brussels

MSI exchange in the Leuven library

It was a great discussion about multispectral imaging with the colleagues from Leuven and the participants from the KIK_IRPA.
The last time I saw the colleague from Leuven before the pandemic was in London in February 2022 at the Charisma meeting. It was once again a good "face to face" exchange on multispectral photography, as we were able to compare the first generation Phase One MSI system with an acchromatic sensor, which had been in use there for several years, with the current Rainbow system with an RGB sensor and we discussed also about software development. Conclusion: user experience is priceless.

Lectures at MUTEC 2022 Annette T. Keller - International trade fair for museum and exhibition technology

Lectures at MUTEC 2022

International trade fair for museum and exhibition technology

I supported Phase One there for three days. Due to two lectures, together with the product manager Gerald Schnittger, on technology and the use of multispectral imaging data and their evaluation, interesting international contacts resulted and the interest in the automated Rainbow Multispectral Imaging Solution from Phase One, which I helped to develop, was great. Likewise on the 3D CultArm of Fraunhofer IGD with Phase One camera technology.

Multispectral Narrow Band investigation Uni Hohenheim Fragments of a ducal letter- Annette T. Keller. Imagesource University of Hohenheim

University Hohenheim

Fragments of a ducal letter

I spent two days on the beautiful campus in Hohenheim Castle in the archive to examine eight fragments of a letter from Duke Carl Eugen using multispectral narrow band images.
In July, as part of a seminar on multispectral photography at the Academy of Fine Arts in Stuttgart, I examined two fragments of this letter for their legibility. The results were interesting and revealed some previously invisible parts of the text. Now, in October, several parts of text could be made visible and could possibly be further optimized by so-called "statistical analyses", such as principal component and independence component analysis. This now needs to be checked. The Phase One Rainbow MSI system already offers some very good starting options in its software. If these are not sufficient, the image data can be fed into more complex processing software. This gives hope for an improvement in readability and hopefully contributes to an understanding of the content of this letter.
Imagesource: University Hohenheim

Multiband investigation St. Prokulus, Naturns - Annette T. Keller

St. Prokulus, Naturns

Multiband investigation

For an interdisciplinary exchange about the multispectral images I created in 2017 and 2018 and their results, we met in Naturns in October together with colleagues from Italy (conservation and monument preservation) and Switzerland (St. Johann Monastery and the SUPSI - Scuola universitaria professionale della Svizzera Italiana).The optical phenomena observed in the first two recording campaigns were discussed in order to use this as a basis to define the other areas of mural painting that appeared interesting for the multispectral documentation and to work out approaches to clarifying the phenomena. These were implemented by SUPSI on the same day. Further scientific analyzes will certainly follow on the basis of these results.

Workshop MSI Multiband Klassikstiftung Weimar - Annette T. Keller. Image source: klassik-stiftung.de

Workshop MSI Multiband

Klassikstiftung Weimar

After the introduction to the theoretical basics of multispectral photography, I worked with my colleagues in Weimar in two days to develop a workflow for multiband digitization that can be used efficiently for their specific project-related issues. In this specific case, the Phase One Rainbow MSI System was adapted to the needs of the documentation and modified in a goal-oriented manner.
Image source: klassik-stiftung.de

Workshop British Library Multispectral Imaging - Anette T. Keller

Workshop II - British Library

Multispectral Imaging

In this three-day workshop we talked about the theoretical basics of optics and specifically about wave and particle optics in multispectral imaging, reflectance and photo-induced luminescence images. Background information is very helpful here. This is the only way to identify deviations and make object-specific corrections.
In order to use the MSI system in the best possible way, I work out suitable workflows with the specialists, provide support when starting into the "invisible" and answer user-specific questions. The assessment and evaluation of the images is also a focus.
My goal is always to convey the maximum benefit for a wide variety of issues.

Lectureship at the ABK Stuttgart, Multispectral Imaging in theory and practice - Anette T. Keller

Lectureship at the ABK Stuttgart

4 days Multispectral Imaging in theory and practice

Once again, I had the pleasure to accompany a seminar together with Prof. Roland Lenz at the Staatliche Akademie der Bildenden Künste in Stuttgart during the summer term 2022. This time we focused on multiband and narrow band imaging, but also the statistical analysis of image data was considered. The students were able to work on manual imaging equipment as well as on now partially automated equipment to get an idea of the development in this sector. Background information on optical fundamentals such as reflectance and luminescence, measurements of filter transmissions and light emissions were also covered.

Forensics Workshop Rainbow Multiband & Narrow Band Imaging - Anette T. Keller

Forensics Workshop

Rainbow Multiband & Narrow Band Imaging

At the Federal Criminal Police Office in Wiesbaden, I discussed solutions for an automated workflow adapted to their requirements with colleagues for radiation diagnostic imaging procedures. We worked on a wide variety of objects with luminescence and reflection methods to test how body fluids can be differentiated on a wide variety of substrates. But we also investigated other objects and worked on optimizing the visualization for the respective application.
Every object is different, which is why the automated system can be tailored to individual use of the individual components and can also be used entirely manually if necessary.

Ernst Ludwig Kirchner's "Badende im Raum", Investigation in Multiband & Narrow Band - Anette T. Keller

Kirchner's "Badende im Raum"

Investigation in Multiband & Narrow Band

In June 2022 I examined two sections of the painting. We used the Phase One Rainbow MSI system. The multiband stacks showed, among other things, interesting infrared luminescences, which were displayed as spectral curves by means of the quantitative evaluation of the supplementary narrow band image data. This gave us a better insight into the material differences, material distribution and chemical composition. Together with Lisa Wagner and Rhe Suykens from the Saarland Museum and Prof. Roland Lenz from the State Academy of Fine Arts in Stuttgart, we discussed the results and began to classify them.

Feather, fashion and cross cultural exchange, Research project at the Weltmuseum Wien - Annette T. Keller

Feather, fashion and cross cultural exchange

Research project at the Weltmuseum Wien

The project, which has been ongoing since 2021, involves research by Weltmuseum Vienna on featherwork from Mexico and maintains a collaboration with the National Museum of Anthropology in Mexico City. Stories of cross-cultural encounters are uncovered based on a feather mark. In addition to consultation with ornithologists, advanced non-destructive imaging analysis techniques have been tested. Together with Gerald Schnittger, I examined the feather work with the Phase One Rainbow MSI system using multiband and narrow band image information. Currently I am still in exchange with the Weltmuseum colleagues for the evaluation of the image data and material specific classification.

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Lost notes Anna Amalia Library, Weimar - Annette T. Keller

Lost notes

Anna Amalia Library, Weimar

In a blog post from October 2021 I came across my multi-band recordings made a few years earlier. New findings on the restoration of the sheet music believed lost after the fire in the Anna Amalia Library in 2004 are now being used to save the day.The approximately 3,000 heavily damaged music manuscripts and prints that were found among the books recovered from the ashes are being processed using a new method. Here, nanocellulose plays an important role (left).

Article

How does multispectral imaging connect to scientific analysis? Vatican, Prado, Universities, Libraries… Annette T. Keller

Vatican, Prado, Universities, Libraries…

How does multispectral imaging connect to scientific analysis?

On my trip through Italy and Spain, in exchange with colleagues, my focus was on this question above. Since we can now combine diagnostic imaging techniques, such as multiband and narrow band imaging, with scientific analyses, we are currently able to use up to 30 congruent image data in reflectance and photo-induced luminescence. The result is a visual representation and the evaluation of reflection data (spectra readout). This helps to make more and more precise observations on the objects and to show more assessments of the material distribution and differentiation. Since I have been using the Rainbow software and the workflow, which I developed together with my colleagues from Phase One, I can much better support - in an interdisciplinary exchange - the scientists on their choice of the following scientific examination methods. The very precise high resolution allows a mapping (150MP) to indicate exactly abnormalities.

Luminescences in the visible range, State Criminal Police Office in Saxony- Annette T. Keller

VIVL Workflow

Luminescences in the visible range

At the State Criminal Police Office in Saxony, I discussed solutions for an automated workflow with the colleagues for imaging processes that are adapted to their requirements. Above all, the visible induced luminescence detected in the visible range plays a major role, because fluorescence/luminescence can be used to detect organic materials and body fluids without destroying the evidence. The excitation is effected by a visible, narrow-band LED light source, but its luminescence effect is detected in a visible range with longer wavelengths. The goal is an automated recording process. This can be individually adapted and integrated into the existing Phase One Rainbow multispectral imaging solution.

Ausstellung AlbrECHT DÜRER? Ein rätselhaftes Meisterwerk - Annette T. Keller

Ausstellung AlbrECHT DÜRER?

Ein rätselhaftes Meisterwerk

My multispectral imaging data made in St. Stephen's Cathedral in Vienna in October 2018, which I evaluated in collaboration with Prof. Roland Lenz, ABK Stuttgart, will be partially on display in this exciting exhibition from May 20th to September 4th, 2022. For this purpose, I combined the individual infrared images of the bishop's gate to form an overall picture.
On the website of the Albrecht-Dürer-Haus in Nuremberg you can get information about the research and the controversy discussion.

Imaging procedures - Technical Article Annette T. Keller

Imaging procedures

Technical Article

My joint article with Prof. Roland Lenz entitled Photo-induced luminescence on murals, multispectral imaging in practice will be published in the workbook series of the Brandenburg State Office for Monument Preservation and Archaeological State Museum, 2021. The Workbook is entitled Bildgebende Verfahren – Trends und Fallbeispiele zur zerstörungsfreien Untersuchung und Erhaltung von Kulturerbe „Ich sehe was, was Du nicht siehst“ and will be published in the second quarter of 2022 by Hendrik Bäßler Verlag, Berlin. 180 pages with numerous photos and graphics, hardcover provide information on the current imaging processes.

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Universitätsbibliothek Leipzig Workshop Multispectral Imaging - Annette T. Keller

Universitätsbibliothek Leipzig

Workshop Multispectral Imaging

This two-day workshop focuses on the theoretical basics of optics (wave and particle optics), i.e. reflections and photo-induced luminescence. Background information is important and helpful. This is the best way to identify deviations and make object-specific corrections.
In order to use the MSI system in the best possible way, I work out suitable workflows with the specialists, provide support when starting into the "invisible" and answer user-specific questions.
The evaluation of the images also plays a central role. My goal is to convey the maximum information content, both with regard to material-specific issues and in terms of readability.

Interdisciplinary conference NON INVASIVE! - lecture Possibilities and Limits of multispectral investigation methods on fragmentary wall paintings Prof. Roland Lenz, Annette T. Keller

NON INVASIVE!

Interdisciplinary conference

As part of the interdisciplinary conference of the HAWK (Faculty of Building and Preservation and Hornemann Institute) in cooperation with the Brandenburg State Office for Monument Preservation and Archaeological State Museum as well as the Brandenburg Cathedral Foundation, Prof. Roland Lenz from the ABK-Stuttgart spoke in his lecture entitled Possibilities and Limits of multispectral investigation methods on fragmentary wall paintings also results of our ongoing research on this topic in recent years.

Lecture Cultura Suisse - Annette T. Keller Reveal the invisible

Lecture Cultura Suisse

Reveal the invisible

The joint lecture by Gerald Schnittger (Product Manager MSI at Phase One) and I aimed to provide information about the new technical possibilities and to show the MSI (multispectral imaging) application in case studies.
The automated multispectral examination solution I helped to develop can be seen as a link in a chain of non-invasive examination methods in art diagnosis.
Multiband and Narrow Band imaging are now playing an increasingly important role, since the image data can now also be evaluated quantitatively and displayed as a spectral curve and/or processed further in statistical analysis.

British Library London - Annette T. Keller Workshop Multispectral Imaging

British Library London

Workshop Multispectral Imaging

In this three-day workshop we talked about the theoretical basics of optics and specifically about wave and particle optics in multispectral imaging, reflectances and photo-induced luminescence images. Background information is very helpful here. This is the only way to identify deviations and make object-specific corrections.
In order to use the MSI system in the best possible way, I work out suitable workflows with the specialists, provide support when starting into the "invisible" and answer user-specific questions. The assessment and evaluation of the images is also a focus.
My goal is always to convey the maximum benefit for a wide variety of issues.

artIMAGING Multispectral Imaging Annette T. Keller - Online Workshop Multiband

Online Workshop Multiband

Landeskriminalamt Niedersachsen

In a personalized one-day workshop, I provide information on the theoretical fundamentals of multispectral imaging and their evaluation and answer user-specific questions. In order to make the best possible use of the MSI system, I work out suitable workflows with the specialists, give advice and support the start into the "invisible". Background information is very helpful here. This is the only way to identify deviations or to make object-specific corrections. It is my goal to convey the maximum benefit for a wide variety of issues.

artIMAGING Multispectral Imaging Annette T. Keller - Project Swiss National Museum, Scuola universitaria professionale della Svizzera italiana (SUPSI), pro Kloster St. Johann Foundation

„The Detached Wall Paintings from the Attic of the Monastery Church St. Johann in Müstair in the Collection of the Swiss National Museum

Research and development of a conservation and restoration concept”

It was a great pleasure for me to be able to support the project described above at its start in 2019, with my multispectral multiband recordings. The project was initiated and carried out jointly by the Swiss National Museum, the Scuola universitaria professionale della Svizzera italiana and the Pro Kloster St. Johann Foundation and, despite the difficult work situation, was completed as planned in August 2021. As part of a closing event on Tuesday, November 30, 2021 at the SUPSI in Mendrisio, the project, the results and findings and the developed concept of measures were presented.

artIMAGING Multispectral Imaging Annette T. Keller - VIS & UV-induces VIS-Luminescence, high resolution in the air by balloon in the St. Johann monastery church in Müstair

VIS & UV-induces VIS-Luminescence

High resolution in the air by balloon in the St. Johann monastery church in Müstair

We used scaffolding-free observation of "areas of interest" on wall paintings through the use of the Photolifter lifting system in combination with my Phase One high-end resolution camera (150MP) for the first time. The method is suitable for creating a base map in the visible spectrum and provides initial information relating to conservation (UV-induced luminescence). As an innovative, contact-free documentation technology, it enables the planning of research projects on the wall paintings in hard-to-reach places without construction.By making the smallest details visible, both in terms of painting technique and state of conservation, as well as the materials used, this base material supports the selection of further analysis techniques such as multispectral imaging in multiband and / or narrow band, FORS, XRF or other scientific methods. In addition, monitoring is possible, which makes the Egyptian blue, which has been detected here, visible in its distribution on the wall in the live image via visible-induced infrared luminescence. The photogrammetric post-processing of the data provides further valuable information for the restorer and his work through a 3D relief display.

Thanks to Dr. Patrick Cassitti (Kloster St. Johann Müstair), Prof. Dipl.-Rest. Roland Lenz (ABK Stuttgart), Daniel Roeseler (Photolifter) to make possible this test installation.

artIMAGING Multispectral Imaging Annette T. Keller - Contribution to the 14th Conservation Science Colloquium Berlin / Brandenburg

„Ich sehe was, was du nicht siehst.“

Contribution to the 14th Conservation Science Colloquium Berlin / Brandenburg

The Brandenburg State Office for the Preservation of Monuments and the State Archaeological Museum, the Potsdam University of Applied Sciences, the Rathgen Research Laboratory for the Prussian Cultural Heritage Foundation and the Prussian Palaces and Gardens Foundation Berlin-Brandenburg once again jointly organized the 14th Conservation Science Colloquium in Berlin / Brandenburg.Prof. Roland Lenz presented our joint contribution, which will also appear in the publication, with the title: Photo-induzierte Lumineszenzen an Wandmalereien – Multispectral Imaging in der Praxis, Prof. Dipl.-Rest. Roland Lenz, Academy of Fine Arts Stuttgart, Annette T. Keller.

The publication for the colloquium will appear a little later due to the current corona situation.

artIMAGING Multispectral Imaging Annette T. Keller - MSI at Exponatec, International Trade Fair for Museums, Conservation and Heritage

MSI at Exponatec

International Trade Fair for Museums, Conservation and Heritage

This year I'll be back at Exponatec, together with Fraunhofer IGD and Phase One. Interesting discussions despite high corona numbers - the attention to the development of imaging procedures is very great and the application requirements differ. I am learning a lot in this exciting exchange and I am going home with a lot of input and ideas for multispectral applications. I am always happy to see that the method is becoming more and more established at a high level.

artIMAGING Multispectral Imaging Annette T. Keller - Workshop Multiband & Narrow Band Saxon State Library - State and University Library Dresden (SLUB)

Workshop Multiband & Narrow Band

Saxon State Library - State and University Library Dresden (SLUB)

In a personalized two-day workshop, I provide information on the theoretical basics of multispectral imaging and the evaluation of image data and provide support with the first start-up. In order to make the best possible use of the newly installed Rainbow MSI system, I work out suitable workflows with the specialists on site, give advice and support the start into the "invisible". Background information is also helpful when a lot of things run automatically. This is the only way to identify deviations or to make object-specific corrections. It is my goal to convey and support the maximum benefit for a wide variety of issues within the library. The users try to optimize the legibility, but also provide information for the preservation or about the condition of the objects.

artIMAGING Multispectral Imaging Annette T. Keller - Documents & manuscripts Test installation at the Bibliothèque Nationale de France (BnF), Paris

Documents & manuscripts

Test installation at the BNF in Paris

Together with Gerald Schnittger (Phase One) and the French partner, the Bibliothèque Nationale de France implemented for two days the automated Phase One Rainbow System, which I am involved in developing. It combines multiband and narrow band imaging in one structure and currently delivers (24) congruent images. The generated reflection recordings and photo-induced luminescence are created quickly and precisely with this mobile system in an intuitive software control. An integrated analysis tool enables initial statistical analyzes to be carried out quickly.

artIMAGING Multispectral Imaging Annette T. Keller - Multispectral test installation in Vienna at the Weltmuseum & Kunst Historisches Museum

Multispectral test installation in Vienna

at the Weltmuseum & Kunst Historisches Museum

How can you bridge the gap from multispectral imaging to scientific methods? The Multiband & Narrow Band stacks of the Phase One Rainbow System bring together qualitative and quantitative information and thus form a basis for planning investigation campaigns, based on the consideration of the area. The precision of the calibration of image information plays an essential role, as does the subsequent discussion in the interdisciplinary team, i.e. together with the restorers, natural scientists, art historians ...

artIMAGING Multispectral Imaging Annette T. Keller - Rainbow Multispectral Imaging Workshop LKA Saxony

Rainbow Multispectral Imaging Workshop

At the LKA Saxony

Together with the photographers from the State Criminal Police Office, we developed automated workflows for the forensic investigation of objects using multiband imaging. After a one-day theoretical introduction to wave and particle optics, we discussed specific non-invasive applications.

artIMAGING Multispectral Imaging - Rainbow Multiband & Narrow Band, Weimar

Rainbow Multiband & Narrow Band in Weimar

Works by well-known artists in spectral analysis

Together with Carsten Wintermann, I examined monochrome and polychrome surfaces for a week and we discussed the results and analysis options of the multispectral imaging methods offered by the Phase One MSI Rainbow System in part in an interdisciplinary team. We also checked the statistical analysis results of the Narrow Band Imaging, but also the visual luminescences of the Multiband Imaging, by means of further metrological analyzes such as Raman spectroscopy and X-ray fluorescence (XRF). Foto: Carsten Wintermann

artIMAGING Multispectral Imaging - MSI Documentation of laser cleaning wall paintings east choir of St. Sebald, Nuremberg

MSI Documentation of laser cleaning

of the wall paintings in the east choir of St. Sebald in Nuremberg

In June 2021, after the laser cleaning, I examined the sections that were already documented in 2018 in a multispectral manner. Together with colleagues Ursula Drewello, Rainer Drewello, Julia Feldtkeller, Alexandra Fritsch, Eberhard Holter, Fabian Schorer and Nadia Thalguter, the results will now be evaluated and discussed on an interdisciplinary basis.

artIMAGING Multispectral Imaging - Calibration workflow MSI Multiband Imaging Charisma Workshop, London

Calibration workflow MSI Multiband Imaging

presented at the Charisma Workshop in London and now published in July

With Prof. Roland Lenz from the Academy of Fine Arts in Stuttgart, we have developed an extension to optimize the calibration of Multiband Imaging. Several reference materials and targets are used for each method. This is described in the article just published by the Austrian Journal for Art and Monument Preservation, LXXV, 2021, Issue 1/2 - Albrecht Dürer in Wien? Die Illusion eines Flügelaltars im Stephansdom.
Our contribution in this volume is entitled: Reflection, Absorption and Luminescence - Radiation Diagnostic Phenomena on Composition, Painting Technique and Material-Specific Issues on the mural in the vestibule of the Bishop's Gate in St. Stephen's Cathedral in Vienna. Annette T. Keller / Roland Lenz.

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artIMAGING Multispectral Imaging - Technical article Radiation Diagnostic Phenomena St. Stephen's Cathedral, Austrian Journal for Art and Monument Preservation

Technical article Radiation Diagnostic Phenomena

on compositional, technical and material-specific questions on the mural in the vestibule of the Bishop's Gate in St. Stephen's Cathedral in Vienna

With Prof. Roland Lenz from the Academy of Fine Arts in Stuttgart, I carried out the examination of the mural using multiband imaging. This can be read and described in the article just published by the Austrian Journal for Art and Monument Preservation, LXXV, 2021, Issue 1/2 - Albrecht Dürer in Wien? Die Illusion eines Flügelaltars im Stephansdom.
Our contribution in this volume bears the full title: Reflection, absorption and luminescence - radiation diagnostic phenomena on compositional, technical and material-specific questions on the mural in the vestibule of the Bishop's Gate in St. Stephen's Cathedral in Vienna. Annette T. Keller / Roland Lenz.

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artIMAGING Multispectral Imaging - Article in Corriere della sera – La lettura - Leonardos „Il Cenacolo in posa all´esame dei clic”

Leonardos „Il Cenacolo in posa all´esame dei clic”

Article in Corriere della sera – La lettura

In July this newspaper article appeared in the Sunday edition of Corriere della sera. I am very proud of this mention by name and it is a great honor to be able to examine this world-famous wall painting by such an extraordinary artist in a multispectral manner.

artIMAGING Multispectral Imaging - Technical Contribution in the „Dürer war hier“ catalog

Technical Contribution in the „Dürer war hier“ catalog

edited by Peter van den Brink

The exhibition “Dürer war hier. Eine Reise wird Legende” in the Suermondt-Ludwig-Museum in Aachen under the patronage of Federal President Dr. Frank-Walter Steinmeier, can be seen until October 24th, 2021 and deals with Dürer's trip to the Netherlands and Aachen from 1520-21. Together with Georg Josef Dietz from the Kupferstichkabinett in Berlin, I examined the back of a drawing. The aim was to make this visible again. The title of our article is: Ein verborgenes Interieur. Zum Verso einer Silberstiftzeichnung aus Dürers Skizzenbuch der niederländischen Reise. Georg Josef Dietz / Annette T. Keller

artIMAGING Multispectral Imaging - Introduction to Arabo-Islamic Manuscript Culture

Introduction to Arabo-Islamic Manuscript Culture

Certificate of Attendance

In July I took part in a three-day workshop to improve the interpretation approaches of my narrow band and multiband image data. The exciting webinar, organized by the Eberhard Karls University of Tübingen and the Qatar National Library, was entitled "Introduction to Arabo-Islamic Manuscript Culture".

artIMAGING Multispectral Imaging - Installation Phase One MSI system Laboratorio Fotografico Biblioteca Apostolica Vaticano, Rom

Biblioteca Apostolica Vaticano

Installation of the Phase One MSI system in the Laboratorio Fotografico

After a few delays due to the pandemic, we were finally able to install the automated, high-resolution multispectral recording and analysis system in July. With the methods of multiband imaging and narrow band imaging, analysis can be made about materials and material distribution, the state of conservation, but also better legibility can be achieved, to name just a few features of the non-invasive technology.

artIMAGING Multispectral Imaging - Biblioteca Capitolare in Verona

Dante in Verona 1321 - 2021

Did Dante also visit the Biblioteca Capitolare?

In March 2021, the Italian television broadcaster RAI reported in Telegiornale TG2 on the 700th year of Dante's death on the scientific studies at the Biblioteca Capitolare in Verona. It is the oldest library in the world of the Latin cultural area, which is still in active today.
The manuscripts will be recorded in Multiband & Narrowband with the Multispectral Imaging System developed by Phase One with my participation and examined for traces of Dante, the “sacro grande della letterature italiana”. Will there be found any traces of his presence in the Biblioteca Capitolare, perhaps a signature?

Watch here

artIMAGING Multispectral Imaging workshop at the Landesarchiv NRW

MSI Workshop at the Landesarchiv NRW

Multiband & Narrowband stacks

The one-day workshop dealt with calibration and image stacking in multi and narrow band of paper documents.
For the first time, the analysis tools for statistical analysis of the narrowband data, which are now integrated in the automated Phase One Rainbow MSI recording system, were presented here.

La Repubblica - Riapre il Cenacolo a Milano - Annette T. Keller

Riapre il Cenacolo a Milano

Annunciati nuovi interventi…

The Italian daily la Repubblica published an article on February 8, 2021, announcing the 2021 research campaign on one of the world's most famous murals - Il Cenacolo by Leonardo da Vinci. The work that adorns the north wall of the refectory in the Dominican Convento Santa Maria delle Grazie was created between 1494 and 1498. I am happy to be in the team and to carry out the multispectral imaging examination.

La Repubblica

Workshop at the Kunsthistorisches Institut in Florence - Annette T. Keller

Workshop at the Kunsthistorisches Institut in Florence

I am happy about the invitation to another workshop in the Fotothek. Together with the deputy director Dr. Ute Dercks and the photographers, we set up the workflow for the reproduction of different objects, as slides and negativs and antique photos for example. Color accuracy and illumination, among other parameters, play an important role in ensuring that ISO standards are met. Since the institute also accompanies photo campaigns, a cambo camera is also used, whose adjustment paths are necessary. This camera can also be combined with the high resolution Phase One 150MP medium format digital back.

Multispectral imaging in multi- and narrowband Biblioteca Capitolare Verona - Annette T. Keller

Multispectral imaging in multi- and narrowband

At the Biblioteca Capitolare Verona

The Biblioteca Capitolare in Verona is considered as one of the oldest still working library of the world. It was originally founded as a scriptorium: a kind of writing laboratory dedicated to the production of parchment books for the education and spiritual formation of future clergy. I am pleased that the Phase One Rainbow System, which I helped develop as a significant part in designing this product, is now being used there to digitize and analyze the ancient documents with the support of the University of Verona.

Workshop on multispectral multiband photography of three-dimensional glass objects at the restoration center of the city of Düsseldorf - Annette T. Keller

Workshop on multispectral multiband photography of three-dimensional glass objects

at the restoration center of the city of Düsseldorf

Together with the conservators of glass, wood and plastic objects, I have developed a workflow that makes the acquisition of objects before, during and after restoration comparable. The documentation of all details is a priority. The 150MP camera allows a resolution of 1200dpi for the A4-size, that is mainly used here and thus allows a very detailed observation of the surfaces through 100% "zoom-in" in all wavelengths.

Teaching assignment multispectral imaging at the State Academy of Fine Arts Stuttgart - Annette T. Keller

Teaching assignment multispectral imaging

In July 2020, I deepen the application of multispectral imaging in theory and practice in conjunction with the first lecture on this topic in May 2017, with the students of the master's program in Conservation and Restoration of Wall Painting, Architectural Surfaces and Stone Polychromy.

Examination of an Albrecht Dürer drawing at the Kupferstichkabinett in Berlin - Annette T. Keller

Examination of an Albrecht Dürer drawing

at the Kupferstichkabinett in Berlin

The Kupferstichkabinett is the largest graphic collection in Germany - and one of the four most important in the world. It makes me even more happy to analyze a work by Albrecht Dürer (1471-1528) using multispectral imaging and thereby contribute to improving the "legibility" of the drawing.

Faculty of Cultural Studies at Cologne Institute of Conservation Sciences: online meeting on the topic of special documentation techniques - Annette T. Keller

Special documentation techniques

I am delighted to have been invited by the Faculty of Cultural Studies at Cologne Institute of Conservation Sciences in the context of an online meeting on the topic of special documentation techniques. I talked about multispectral photography and technical innovations in multispectral imaging for multiband & narrowband and integrated automation processes in Phase One Rainbow Systems.

Annette T. Keller Multiband imaging in St. Stephen's Cathedral in Vienna: Possible Albrecht Dürer Wall Drawing discovered

Possible Albrecht Dürer Wall Drawing discovered

Multiband imaging in St. Stephen's Cathedral in Vienna

Albrecht Dürer (1471-1528) may have left a wall drawing in St. Stephen's Cathedral in Vienna. At least some experts assume this, who examined and discussed a recently uncovered or cleaned mural at a conference in Vienna on Friday, November 15, 2019. Prof. Roland Lenz (ABK Stuttgart) presented my results of multiband imaging at the conference.

Read more: www.erzdioezese-wien.at

Fully automated solution for Multi- and Narrowband

Introducing Phase One Rainbow Multispectral Imaging Solution

Fully automated solution for Multi- and Narrowband

I am proud to have a significant part in designing this product. The system allows multispectral investigations, e.g. non invasive and non-destructive analysis of polychrome surfaces, evidence in forensics and for quality control of production processes. „Perfect stacks“ from UV to infrared, are generated in the highest resolution at the push of a button, perfectly calibrated and repeatable.

brochure

Technical contribution in conservation 360° - Annette T. Keller

Technical contribution in conservation 360°

UV-VIS Luminescence Imaging techniques

Just 3 weeks after publication, 3800 downloads were already made. It makes me proud to be among the many great authors. The volume of the bilingual open-access Conservation 360° series „UV-Vis Luminescence Imaging techniques / Técnicas de Imagen de Luminiscencia UV-Vis“  has been published as pdf and can be downloaded here.
Special thanks go to the editors Marcello Picollo, Maartje Stols-Witlox and Laura Fuster-Lopéz for all their efforts.

volume 360° conservation download

Workshop multispectral imaging with multi- & narrowband technology - Annette T. Keller at the Technical Center of the State Archives NRW

Workshop multispectral imaging with multi- & narrowband technology

at the Technical Center of the State Archives NRW in Münster

The focus was on theory, practice and evaluation over two days. The fully automated Phase One Rainbow MSI Systems was used the first time in my MSI workshop. With this new technology, a total of 24 images in reflection and luminescence are currently being created for each object, which contribute to a better understanding and research of the object. The images provide information about material and pigment distribution, similarities and abnormalities and can contribute to a better legibility of the object, in addition the images can then be statistically evaluated and provide qualitative and quantitative information.

Rainbow

Technical contribution Preliminary non-invasive study of Carolingian pigments 
in the churches of St. John at Müstair and St. Benedict at Malles

Technical contribution Preliminary non-invasive study of Carolingian pigments 
in the churches of St. John at Müstair and St. Benedict at Malles

Archaelogical and Anthropological Sciences, February 2020

Together with colleagues from Switzerland, Italy and Germany, we worked on this analysis in an interdisciplinary manner using various non-destructive methods to investigate the relationships between the two churches in Switzerland and Italy mentioned in the title.

read the article

Workshop to update the CHARISMA MSI protocols, British Museum, February 2020

Workshop at The British Museum

Workshop to update the CHARISMA MSI protocols, 27-28 February, 2020

I was very happy to have been invited to Joanne Dyer's Update Workshop in London and to meet many colleagues again. In short lectures we exchanged experiences with the method. We, forty international participants, discussed the improvement and expansion of the current method and talked about options for the future.

MSI analysis as part of the Piranesi research project - Annette T. Keller

MSI analysis as part of the Piranesi research project

The Staatliche Kunsthalle in Karlsruhe has two albums with a total of 297 drawings

In 2014, a spectacular redefinition was achieved in the State Art Gallery in Karlsruhe. Since then, the two albums can be assigned to the Roman etcher, architect, theoretician, antiquarian and antique dealer Giovanni Battista Piranesi (1720–1778), his workshop and other artists working in Rome. The Kunsthalle owes this discovery to Georg Kabierske, who was an intern at the time and is now a student of art history. In February I did multispectral imaging on all of the drawings. This image information is now being evaluated at the Kunsthalle.

read more

Technical contribution Annette T. Keller on the analyses in St. Sebald

Technical contribution on the analysis in St. Sebald

(Laser) light at the end of the tunnel, wall paintings in the east choir of St. Sebald in Nuremberg

This article was written together with colleagues Rainer Drewello, Ursula Drewello, Julia Feldtkeller, Alexandra Fritsch, Eberhard Holter, Fabian Schorer and Nadia Thalguter and was published in the Denkmalpflege Informationen of the Bavarian State Office for Monument Protection. It informs about the interdisciplinary activities on the wall paintings.

Denkmalpflege Informationen (p. 56-60)

Annette T. Keller - Spectral Imaging in the Bubikon Knight´s House

Spectral Imaging in the Bubikon Knight´s House

Examination of the wall paintings

In the Bubikon knight's house, I examined the chapel and a wall of the lobby. The chapel that still exists today was built at the end of the 12th century. The lobby was added in the second half of the 13th century.
The wall areas specifically selected by the project manager Andreas Franz were captured digitally by me using the following imaging methods: visible diffuse image, raking light, UV reflection, infrared reflectance, UV fluorescence, infrared fluorescence using UV and VIS excitation, electronically created UV and infrared false color images were also created. The first observations are compiled by me in a report and serve as a basis for discussion for an interdisciplinary team
.

St. Proculus, Naturno - spectral photography Annette T. Keller

Technical contribution St. Prokulus in Naturno Conference proceedings 10

Invitation to the presentation of the Volume on January 16, 2020 in the Prokulus Museum

The South Tyrolean Cultural Institute and the local community of Naturno invite you to the book presentation by Mr. Günther Kaufmann.My summary of the observations of the ongoing non-invasive analyzes using spectral photography in St. Prokulus, Naturno, between December 2017 and June 2018 will be presented for the first time in the conference proceedings. Since the investigations are still at the beginning, a final evaluation of the results is not yet possible. First results show figurative representations that cannot be seen with the human eye.

project of the Swiss National Museum for the investigation of Strappi and Stacchi from Müstair spectral photography Annette T. Keller

Conservation Project Swiss National Museum

Spectral Multiband Photography

To support the conservation project of the Swiss National Museum for the investigation of Strappi and Stacchi from Müstair, currently in the Swiss National Museum, as well as the still present in Müstair monastery stocks, I photographed in September and October the wall paintings in reflectance and photo-induced luminescence.

MuseumDigit 2019 Budapest lecture Multispectral Imaging & technical photography Annette T. Keller

Making the invisible visible

Lecture at the MuseumDigit 2019, 27. November, Budapest

Development in Multispectral Imaging and the technical photography. How can we restore the readability of a damaged document? How is it possible to make the invisible visible, to see the tiniest details and material destination of an object? Capturing Images only once in the highest resolution possible. The automated process enables the research into the materials, pigments, bindings, retouching and underdrawings. Moreover, Multispectral Imaging is an analytical tool that delivers important information about an object and can guide other investigations, thanks to multi- and narrowband Image informations.

Vatican Museums workshop multispectral photography Annette T. Keller

MSI Workshop in the Vatican

Multispectral Imaging

The application of multispectral photography was the focus of the three-day workshop. Phase One High End technology was used. The 150MP BSI Digitalback in a modified version integrated into a multi-spectral package developed together with Phase One, consisting of camera, digital back, lighting, filters and targets, mobile and modular and therefore perfectly suitable for use in a museum context.

St. Prokulus, Naturns spectral photography Annette T. Keller

Museum Guide St. Prokulus

Interim report on spectral photography in St. Prokulus

My summary of the observations of the ongoing non-invasive analyzes using spectral photography in St. Prokulus, Naturno, between December 2017 and June 2018. The church is dedicated to Saint Bishop Prokulus of Verona. As the investigations are still in their infancy, no final evaluation of the results is possible at the present time.

Lecture at the symposium 2019
 “forensic photography”

The focus of my presentation was the new development, together with Phase One, for the automated digital capture of objects and materials in the multi-band and narrowband range to the max. Optimization of repeatability and investigation of materials of interest to crime technology.

artIMAGING conservation analysis project of two Pieter Bruegel masterpieces: The Strife Of Lent and Winter Scenery

A conservation analysis project of two Pieter Bruegel masterpieces

Study of The Strife Of Lent and Winter Scenery

The project was carried out by Loa Ludvigsen, Anne Haack Christensen and Jørgen Wadum from SMK in Copenhagen, and supported by me, as the Phase One´s Multispectral Imaging specialist. The equipment used was a Phase One XF IQ3 100MP Camera System, filters and LED lights. The kit was designed to deliver a stack of images according to the Charisma manual (British Museum 2013), that allows for analysis of different components of the paintings.

Video

artIMAGING Article in the Journal of Cultural Heritage: Mainly red and a hidden blue - Laboratory and MSI investigations on the Carolingian wall painting in the Chapel of the Holy Cross of Müstair, Switzerland

Article in the Journal of Cultural Heritage

Mainly red and a hidden blue - Laboratory and MSI investigations on the Carolingian wall painting in the Chapel of the Holy Cross of Müstair, Switzerland

was published in August. Together with Christine Bläuer (CSC Sàrl), in this article I have referred to scientific investigations connecting multispectral photography using the example of the UNESCO World Heritage Site in Müstair (CH).

Article

artIMAGING Multispectral Imaging & avant-garde

avant-garde

Painting study in Bulgaria

In August, I studied ten paintings in Sofia using multispectral imaging. Particularly interesting here was the differentiation of the white pigments titanium white rutile and titanium white anatase, as they appeared at different times on the art market and thus can make an assignment of the artworks possible. At the end of the year, an article in Conservation 360 ° will be published on details of the recording procedures leading to the differentiation of rutile and anatas, published together with Prof. Roland Lenz of the State Academy of Fine Arts Stuttgart and colleagues from Politecnico di Milano and the University of Gothenburg.

artIMAGING Spectral Multiband Imaging UNESCO World Heritage Saint John Abbey, Müstair

Spectral Multiband Imaging

Unesco World Heritage Saint John Abbey, Müstair

In the summer of 2018, the conservation work of the mural paintings in the middle apse in the monastery of St. John in Müstair began. In summer of 2019 I repeated the already recorded areas with spectral multiband photography to document restoration work. We were able to make interesting conclusions regarding the pigment Egyptian blue.

artIMAGING lecture at the the 2+3D conference Amsterdam

2+3D Photography

Amsterdam

During the 2+3D conference I gave a lecture together with Phase One on the topic of multispectral photography. I talked about technical details as well as the practical application of the non-invasive procedure. My colleagues from Phase One presented the technical developments of automation in the field of multispectral photography.

artIMAGING painting analysis and MSI workshop with the City of Dusseldorf

Painting analysis and MSI workshop

City of Dusseldorf

Together with the Department of Painting of the Restoration Center of the City of Dusseldorf I examined two paintings by Angelika Kaufmann in the Kunstpalast in May. The multispectral photography provided i.a. Information on pigment distribution, conservation status and painting technique. This was followed by a three-day workshop on painting/contemporary art, wood/design, ceramics, photography, paper and arts and crafts.

artIMAGING Lecture at the Ecole des sciences criminelles, Lausanne

Lecture at the Ecole des sciences criminelles

Lausanne

Multispectral photography has a long tradition in forensic analysis. Together with Phase One, I presented innovative solutions for the realization of spectral images with a high degree of automation, using practical examples.

artIMAGING Stamp analysis with the Staatlichen Akademie der Bildenden Künste Stuttgart

Stamp analysis

Staatliche Akademie der Bildenden Künste Stuttgart

In April I examined together with the Staatlichen Akademie der Bildenden Künste Stuttgart a selection of stamps on their abnormalities and similarities, conservation status and pigment distribution. The results were summarized in a master thesis.

ABK Stuttgart

artIMAGING is an ICOM (International Council of Museums) member

Icom member Artimaging

As a member of the International Council of Museums, I am committed to the preservation, care and communication of the cultural and natural world heritage. ICOM has more than 35,000 members worldwide and is present as an international network of museums and museum professionals across all disciplines. 119 national committees and 30 international committees as well as numerous regional and affiliated organizations belong to ICOM.

Mantegna and Bellini

On the occasion of the exhibition in the Gemäldegalerie in Berlin my video production Christina Lissmann incontra Andrea Mantegna from the series "The guided view" with music by the composer Nils Frahm gets even more topical.

Watch the video

artIMAGING Multispectral Imaging workshop at the Bibliotheca Hertziana, Rome

Multispectral Imaging workshop

Bibliotheca Hertziana, Rome

At the Max Planck Institute for Art History, the Bibliotheca Hertziana, I conducted a workshop on multispectral photography. We looked at ancient writings and paintings at different wavelengths to improve readability, get information on painting techniques, and document material distribution.

artIMAGING Multispectral Imaging workshop at the Landesarchiv NRW

Multispectral Imaging workshop

Landesarchiv NRW

In order to best support the preservation of archive material, the non-invasive method is also used here. The central restoration department of the Landesarchiv NRW uses multispectral photography (infrared to UVA radiation) to document and analyze the objects.

Technical Contribution

Segni di Maraviglia

Published in summer 2019, the catalog on the history and restoration of textile objects based designed by Pollaiolo for the "Parato di San Giovanni" with my contribution to the results of the analysis by multispectral imaging.

Mandragora

Teaching assignment chemistry & sensitometry

Teaching assigment at Staatliche Akademie der Bildenden Künste, Stuttgart
Art history: Chemistry and sensitometry

Winter semester 2018/2019

Contribution at the symposium 2018
 “forensic science photography”

In co-operation with Phase One Cultural Heritage I talked about the development of opto-electronic multispectral imaging processes in the last two years and showed apllication examples from workshops at BKAs and LKAs.

Multiband at the Stephansdom in Vienna

In October, I examined a wall painting in St. Stephen's Cathedral in Vienna. The image information have been evaluated in collaboration with Roland Lenz, Professor of Conservation and Restoration of Wall paintings, Architectural Surfaces and Stone Polychromy at the State Academy of Fine Arts, Stuttgart.

Multispectral Imaging at SMK In Copenhagen

In August, in cooperation with SMK (Statens Museum for Art), CATS (Center for Art Technological Studies and Conservation) and Phase One, I did multispectral imaging of a Bruegel the elder Painting.

Spectral imaging in Müstair

In the summer of 2018, the conservation of the wallpaintings in the middle apse in the monastery of St. John in Müstair began. In the upper area and in the dome, in consultation with the scientific director Patrick Cassitti, I examined preservation conditions and distribution of the paint layers.

Infrared Liminescence in St. Prokulus

In December 2017 and February & May 2018 I traveled to Naturno to study the murals in St. Prokulus. My interim report will be published in the publications of the South Tyrolean Cultural Institute, Volume 10, St. Prokulus in Naturns / San Procolo a Naturno.

Investigation in Freiburg Minster

In February and April I accompanied the studies and the conservation of the wallpainting of the Peter and Paul chapel in the cathedral of Freiburg im Breisgau. A partial area was recorded photographically in the stitching process, in high-resolution, from UV to infrared.

MSI in St. Sebaldus Church in Nuremberg

Three late-medieval, side-by-side murals that are in very poor condition due to war damage were the focus of my photography campaign. The improvement of the readability of the depicted scenes played a role as well as the investigation of references to the restoration history.

Piero della Francesca Conservation

At the end of March, the masterpiece Piero della Francesca The Resurrection was presented. At the end of the restoration, at the end of February, I documented the artwork for the last time in visible light and with specially selected wavelengths in the stitching process.

MSI in Weimar

On behalf of the Klassik Stiftung Weimar I examined fire-damaged documents with charred edges using spectral and multispectral photography. The focus was on the readability of the font.

Profane room settings from 13th century

A test project investigating decorative paintings using spectral photography took me to Erfurt. There I photographed remnants of a former color version in the " Raum mit der Blütendecke" commissioned by the University of Applied Sciences Erfurt.

Teaching assignment chemistry & sensitometry

Teaching assigment at Staatliche Akademie der Bildenden Künste, Stuttgart
Art history: Chemistry and sensitometry

Winter semester 2017/2018

Multispectral Photography

My 3-5-day workshops focus on the application of multispectral photography in the forensic investigation. A theoretical introduction is followed by practical applications and the evaluation of the image information.

Multispectral Imaging

From April to July 2017, I examined parts of the Heiligkreuzkapelle in monastery St. Johann in Müstair.

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Teaching assignment multispectral imaging

Teaching assignment at Staatliche Akademie der Bildenden Künste, Stuttgart
. Master: Konservierung und Restaurierung von Wandmalerei, Architekturoberflächen und Steinpolychromie.

Technical Contribution

Unsichtbares sichtbar machen (making the invisible visible)

Spectral imaging, a non-invasive method.

KulturBetrieb – Ausgabe April 2017

Contribution at the symposium 2016
 “forensic science photography”

In co-operation with Phase One Cultural Heritage I talked about my work and the use of optoelectronic multispectral photographic methods in the art diagnosis and the parallels in the use of forensic investigations.

Contribution

Leonardo in Francia/Léonard en France 1516–2016

is available in Italian and French language with my contribution about the Multispectral Photographie from Ultraviolett to Infrared.

Teaching assignment

Teaching assigment at Staatliche Akademie der Bildenden Künste, Stuttgart
Art history: Chemistry and sensitometry

Winter semester 2016/2017

Technical contribution

Il Caprotti di Caprotti
 Storia di un Pittore che non c’è

is now available in french language, here with my contribution about digital imaging calibration, UV fluorescence and IR false color images.

My planned contribution at the meeting Kein Berühren der Figüren

Multispectral imaging from Ultraviolett to Infrared – non-invasive examinations and the  possibilities and limits to analyze conservation state and pigments. Examples: paintings, frescos, textiles.

Meeting information & program

Multispectral Imaging

In September 2016 I accompany again the restoration of the fresco in Sansepolcro. To document the cleaning of the fresco, I use the UV fluorescence photography. Thus cleaned and uncleaned image areas are clearly visible.

Technical contribution

Ultraviolet-Induced Luminescence Imaging: Giovanni Verri, Annette T. Keller, Francesca Piquè, Alfredo Aldrovandi.

Report of the project ORGANIC MATERIALS IN WALL PAINTINGS. The Getty Conservation Institute summarizes all scientific findings and makes them available for download.

Cappella Peruzzi

From 11 December impressive UV fluorescence images of the entire Cappella Peruzzi ( Florence ) will be on display at the Palazzo Reale in Milan. The images I made during my two-month photo campaign in autumn 2012 will be showcased as multimedia installation at the Giotto, l'Italia exhibition.

Multispectral Imaging

I was highly pleased with the media coverage that commenced even before the restoration process had begun.

La Repubblica Firenze, 28/03/2015
I segreti del dipinto piu bello del mondo
Comincia dopo Pasqua il restauro della Resurrezione di Piero della Francesca a Sansepolcro.
Ma intanto la prima scoperta: l’artista ha impiegato 15 giornate d’affresco per realizzare il dipinto

The mystique of the world’s most beautiful painting
After Easter the restoration of the “Resurrection of Jesus Christ” by Piero della Francesca will begin in Sanselpolcro. Here in advance, the first finding: The artist implemented the Fresco in 15 “Giornate”.

Documentation & art diagnosis

The works of Pollaiolo take centre-stage in a running project with the Opificio delle Pietre Dure in Florence: 27 panels are being documented and diagnosed as part of the restoration process. The project will conclude in spring 2015.

Lecture

Costume Colloquium IV: Colors in Fashion, Florenz

La „cartelle colore“ per il restauro ovvero i database per il riconoscimento delle tinture, e non solo, nei tessili storici: dieci anni di esperienza del Laboratorio di Restauro Manufatti Tessili dell’Opificio delle Pietre Dure di Firenze. Susanna Conti, Alfredo Aldrovandi, Bruno Radicati, Annette Keller, Marcello Melis, Licia Triolo

Technical contribution

The book “Tessuti archeologici. I frammenti copti della collezione Roca Puig. Storia e Conservazione.” on the topic of textile conservation was published in October 2014 and includes a contribution on: “Indagine sui coloranti dei frammenti della collezione Roca-Puig con la tecnica multispettrale. Una nota sulla Radiografia X”. Susanna Conti, Annette T. Keller, Isetta Tosini con la collaborazione di Alfredo Aldrovandi.

Training

In 2013, I prepared and held a 3-day training on the topic of multispectral imaging for the employees of the Associazione laboratorio di diagnostica in Spoleto at the University of Perugia. The participants received an in-depth insight into the theory and practice, techniques and projects.

Would you be interested in a similar training? Please do not hesitate to contact me.