Facing the Future: Imaging Solutions for a Transformed National Portrait Gallery

Lead Research Organisation: National Portrait Gallery
Department Name: Exhibitions and Collections Management

Abstract

Developments in analytical and digital imaging have transformed the way in which galleries, libraries, archives and museums can research, conserve and share the national collection with diverse audiences. At the National Portrait Gallery (NPG), which houses the largest collection of portraits in the world, investment in imaging equipment within the Conservation and Photographic Studios over the last twenty-seven years has enabled the institution to move from a freelance, commission-based model of research, in which works of art were moved to different studios across London for standard analysis, to a world-class centre for Collections' research, with the capacity to undertake ambitious survey projects such as 'Making Art in Tudor Britain' (2007-2014).

This application to the 'Capability for Collections Fund' seeks to maintain the momentum in conservation and heritage science research at the NPG through capital investment at a moment when the Gallery itself is transforming through the Inspiring People project (2020-2023). Upgrading the NPG's suite of imaging equipment, which is at risk of becoming obsolete, in this financial year, will capitalise on the opportunity presented by the review of the whole collection necessitated by the closure and decant of the main gallery building for Inspiring People.

The NPG is seeking funding for the upgrade of the camera and light source on the stereomicroscope in the Conservation Studio, as well as a computed radiography system for use with the existing X-ray equipment, a new infrared reflectography camera, and a new camera for high-resolution digital photography. Each piece of this equipment can be used in isolation, for example in the continuing digitisation of the Collection, such as works on paper in the Reference Collection, or using X-radiography to inform conservation treatments. However, it is when they are used in conjunction with each other that the most innovative and interdisciplinary research can take place, as each imaging tool offers complimentary information on the materiality of works and the techniques used in their creation. The NPG refined its integrated methodology for the use of a range of imaging equipment during the 'Making Art in Tudor Britain' project, utilising X-radiography, infrared reflectography, photomicrography and digital photography to survey early portraits in the Collection and sharing this approach with other national and international collections to allow comparative research to be undertaken. The images created using the different analytical techniques were then shared with audiences through the online database and comparative image viewer, whilst the computers and live-stream microscope feed of the Conservation Studio offered a space in which to convene collaborative research networks and student groups to discuss the images produced by the different methodologies alongside the works of art.

The Inspiring People project seeks to safeguard the NPG's heritage and look to the future in order to allow the Gallery to extend its influence, reach and relevance. Investment in collections capability this year, at the start of Inspiring People, will ensure that the most up-to-date and sustainable conservation and heritage science equipment is available to the Gallery to support research and collections care at this transformational moment. Furthermore, the timing of the investment will enable the images generated by the equipment to be incorporated into the new displays and digital platforms in which the NPG is investing, and to contribute to the broader UKRI ambition to create a truly accessible national collection by ensuring that the images created in the NPG's Conservation and Photographic Studios are of the highest standard and compatible with those created by peer institutions.

Publications

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Description The Capability for Collections award allowed the Conservation and Digital departments at the National Portrait Gallery (NPG) to maintain and upgrade their capability for high quality technical digital imaging, guarding against a real risk of obsolescence. The award allowed the Gallery to purchase: a Leica DMC 6200 Digital Camera for use with an existing MZ16 stereomicroscope as well as LED and UV light sources, improving the quality of microphotography and preventing obsolescence; an HD CR 35 NDT Computed Radiography System, D-Dect X software and computer, allowing digital X-radiography to be produced with the existing X-ray set and eliminating the need for purchase and disposal of development chemicals; an Apollo infrared reflectography camera with macro lens and filters, significantly improving the quality of infrared imaging; and an Hasselblad H6D-400c multishot camera and a new laptop, improving the quality of high resolution digital imaging of the Gallery's collection as well as preventing obsolescence. As core research infrastructure, the new equipment was immediately integrated into the conservation department's workflows once it had been acquired and installed. For example, since April 2021, it has been used during the cleaning and restoration of the portrait of NPG 4451 Katherine Parr attributed to Master John, and to enable the technical investigation of paintings, such as NPG 4839 Laura Knight with model, Ella Louise Naper ('Self Portrait'), which is being undertaken in collaboration with the National Gallery. Since the new equipment was purchased, 1692 portraits (paintings, sculpture, prints, drawings, miniatures, photographs) have been digitised in high resolution, as well as 1535 items from the Library and Archive (including a large selection of sketchbooks from the first director Sir George Scharf, whose drawings of prominent paintings from around the UK formed the basis of our collection), 55 sculptures have been photographed in 360 degrees, 26 infrared reflectograms have been captured, 15 paintings have been X-rayed, and 220 photomicrographs of 19 portraits have been recorded. The grant also provided funding to build a Mirador web-based viewer to allow high-resolution technical images to be viewed and compared easily by NPG staff for conservation assessment and research. As a result, all new technical images, as well as existing digital technical images, have been converted to a IIIF compliant format. External researchers will also able to access these images using a dedicated terminal set up in the public study room of the Heinz Archive and Library. Initially, over 4400 images related to 227 portraits from the collection were available in the viewer, now, nearly two years later, technical images of 363 portraits from the NPG collection are accessible. The objectives of the award were fully met. The equipment was purchased and installed within the timeframe of the award, allowing the NPG to increase the range and quality of technical images of the Collection that can be produced (X-radiographs, infrared reflectograms, photomicrographs and high resolution digital images), improving the efficiency and sustainability of technical analysis at the Gallery, and making the images available as a research resource to a wider audience through the establishment of the IIIF viewer.
Exploitation Route The equipment acquired through the Capability for Collections award will facilitate conservation treatment and new research into the dating and attribution of works, and will further understanding of artistic practice in the production of portraiture. The technical and high resolution digital images produced using the equipment will be accessible to conservators, curators and other researchers at the Gallery, and also to wider academic and public audiences. As a result, there is scope for impact in the cataloguing of the Collection as well as through publications including articles, monographs, and exhibition catalogues. The high technical specification of the images also opens new avenues for cross-collection collaboration, which will be further facilitated by the Gallery's developing engagement with IIIF.
Sectors Creative Economy

Education

Leisure Activities

including Sports

Recreation and Tourism

Culture

Heritage

Museums and Collections

URL https://www.npg.org.uk/collections/research/programmes/conservation/ahrc-capability-for-collections-grant
 
Description The increased in-house capacity for the creation of imaging at the National Portrait Gallery (NPG) has highlighted the value of technical images as a resource, and spurred internal conversations at the Gallery between the Conservation and Digital teams about how this resource can be presented to varied audiences. This has been realised through the onsite digital offer since the Gallery reopened in 2023 following the 'Inspiring People' project, and through the online offer on the website, including the new 'Schools Hub' resource. High resolution digital images have been used in digital interactive presentations throughout the new displays at the NPG, including in the new dedicated miniatures gallery, while a new infrared image of a portrait of Queen Elizabeth I by Nicholas Hilliard (NPG 190) is included in a display space focused on Making Tudor Portraits. Most dramatically, high-resolution digital images captured with the Hasselblad camera were used by Sysco Productions to create the large-scale projection wall in the new Gallery entrance using Epson's 20,000 lumens projectors to create the 15m x 8m image. Since the new equipment was purchased, 2210 portraits (paintings, sculptures, prints, drawings, miniatures, and photographs) have been digitised in high resolution, as well as 1535 items from the Library and Archive (including a large selection of sketchbooks from the first director Sir George Scharf, whose drawings of prominent paintings from around the United Kingdom informed the development of the Gallery's collection), while 55 sculptures have been photographed in 360 degrees. In total, this has resulted in the creation of 6355 digital assets. 39 infrared reflectograms have been captured, 18 paintings have been X-rayed, and 276 photomicrographs of 23 portraits have been recorded. In addition, a new post of Digitisation Officer has been created to facilitate increased levels of digitisation with the Hasselblad camera. The technical images captured using the new equipment purchased with the Capability for Collections Grant are now available to the public through a dedicated terminal in the Heinz Archive and Library public study room in the National Portrait Gallery's Orange Street building. The grant has begun to facilitate greater public access to the NPG collection remotely through the presentation of high resolution and multispectral images. Works such as the sculpture of Elizabeth Barrett Browning and Robert Browning's hands (NPG 3165), are now available as high-resolution 3D models on the Sketchfab platform. The presentation of objects in this format is particularly appropriate for sculpture and 3-dimensioal works because it allows a level of access that is not usually possible in the gallery environment.
First Year Of Impact 2021
Sector Creative Economy,Education,Culture, Heritage, Museums and Collections
Impact Types Cultural

 
Description NPG 4839 Laura Knight technical analysis 
Organisation National Gallery, London
Country United Kingdom 
Sector Charity/Non Profit 
PI Contribution High resolution digital photography, X-radiography, infrared reflectography and microphotography of the painting were undertaken at the National Portrait Gallery to investigate the artist's technique, define the areas of instability and past damage, and developing an understanding of the paint layers where it was occurring. Conservators and curators at the NPG brought knowledge of the artist, the painting and its physical history, as well as interpretation of the technical imaging.
Collaborator Contribution The National Gallery undertook medium analysis of samples taken at the National Portrait Gallery using FTIR and GC-MS, ad interpreted the results to identify the binding media. The painting underwent Macro XRF (MAXRF) scanning at the National Gallery. The results of this analysis were processed and interpreted by staff at the National Gallery.
Impact The portrait of Laura Knight has a history of instability which has restricted its loan to other institutions. Technical analysis of the painting has been used to better understand the flaking paint and its cause in order to plan its future care. Medium analysis indicated that the binder was not contributing to the flaking. MAXRF was undertaken of two areas of the painting where flaking of the paint layer was an ongoing issue. The results of elemental mapping gave an indication of where specific pigments had been used, and how this related to areas of instability and loss, as well as restoration. The interpretation of all the results combined indicated that the instability resulted from the artist's use of specific pigments, including Zinc White, as well as reworking large areas of the painting.
Start Year 2022
 
Description Art of Conservation symposium 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Other audiences
Results and Impact 150 people attended a symposium organised by the Burlington Magazine and London Art Week. This considered how the technical study of paintings informs conservation treatment, various methods of analysis and their application to paintings from different time periods, and what the future holds in this area. Attendees also visited the conservation studios on a tour where they were shown analytical equipment used for examining artworks. Attendees asked questions about how technical analysis might inform digital reconstructions and engaged with technical analysis of artworks.
Year(s) Of Engagement Activity 2023
URL https://londonartweek.co.uk/law-winter-2023-symposium/
 
Description Article in Face to Face- the newsletter for National Portrait Gallery Supporters 
Form Of Engagement Activity A magazine, newsletter or online publication
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Supporters
Results and Impact Face to Face is distributed to NPG members across the UK and all around the world: 2254 by post and 6347 by email. The article discussed the conservation treatment of the portrait of Katherine Parr. The discovery of the pigment Fluorite (illustrated with a photomicrograph captured with CapCo funded camera and light sources), and high resolution infrared images captured with the new infrared camera were highlighted. The purpose of the article was to present the work of the conservation department, including conservation treatment and technical analysis, to supporters and highlight to importance of funding to support these activities.
Year(s) Of Engagement Activity 2022
URL https://issuu.com/npglondon/docs/f2f_issue_68_spring_2022_as_pages/6
 
Description Blog for National Portrait Gallery- Godfrey Kneller's Kit-cat portraits 
Form Of Engagement Activity Engagement focused website, blog or social media channel
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Public/other audiences
Results and Impact Blog written for the National Portrait Gallery website about the conservation of the Kit-cat portraits by Sir Godfrey Kneller, which were examined and conserved in preparation for the new displays at the NPG opening in June 2023. The blog described discoveries related to changes made to the portrait of Charles Lennox, 1st Duke of Richmond and Lennox which were visible in the infrared image, which was captured using the Osiris camera purchased with CapCo funding. Three members of the public left comments on the blog.
Year(s) Of Engagement Activity 2022
URL https://www.npg.org.uk/blog/the-conservation-of-the-kit-cat-paintings
 
Description Careers talk for Art Students from Totton College, Southampton 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach Regional
Primary Audience Schools
Results and Impact An online talk on a career in conservation was presented to approximately 20 Level 3 students and some Level 2 students at Totton College in Southampton. The talk included an introduction to technical analysis, including X-radiography, Infrared Reflectography, microscopy and FTIR. The school reported that the students really enjoyed the session and were really interested to hear about conservation of works of art, and that the teacher was also enthused.
Year(s) Of Engagement Activity 2024
 
Description Remote visit to conservation by National Portrait Gallery Youth Forum 
Form Of Engagement Activity Participation in an open day or visit at my research institution
Part Of Official Scheme? No
Geographic Reach Regional
Primary Audience Schools
Results and Impact 11 members of the National Portrait Gallery's Youth Forum attended a remotely hosted tour of the conservation studio. The participants asked questions about the work of the conservation studio that showed an interest in the work going on in the studio and an active engagement with concepts of technical analysis. The organisers expressed a desire to arrange further visits.
Year(s) Of Engagement Activity 2021
URL https://www.npg.org.uk/learning/young-people/youth-forum/
 
Description STEM careers talk 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach Local
Primary Audience Schools
Results and Impact 70 pupils from Years 7,8 and 9 at Bobby Moore Academy in East London attended an online talk about paintings conservation as a STEM career, including discussing technical analysis using infrared reflectography, X-radiography and photomicrography. Afterwards the students asked questions about working in a museum and how studying science is important for conservation.
Year(s) Of Engagement Activity 2022
 
Description Student visit (remote) Courtauld Institute of Art 
Form Of Engagement Activity Participation in an open day or visit at my research institution
Part Of Official Scheme? No
Geographic Reach Local
Primary Audience Postgraduate students
Results and Impact A virtual visit of the conservation studio was held for five second year conservation students from the Courtauld Institute of Art along with their lecturer. The purpose of the visit was to introduce students to the facilities and equipment of the department as well as discussing conservation treatments and technical analysis. The group were very engaged and asked questions about technical analysis, especially related to the portrait of Katherine Parr NPG 4451 which was in the conservation studio for treatment and Tudor portraiture more generally. The lecturer gave feedback that the students were impressed by the quality images in the presentations.
Year(s) Of Engagement Activity 2021
 
Description Studio tour for Courtauld Conservation Society 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach Local
Primary Audience Postgraduate students
Results and Impact A group of 20 Art History Masters students from the Courtauld came to visit the conservation studio and to see the equipment we have for technical imaging and analysis. The students asked many questions related to conservation treatment, technical art history and how technical analysis can inform conservation treatment. The president of the society said that the event had been very popular and they were grateful to be given access to a working conservation studio.
Year(s) Of Engagement Activity 2024
 
Description Video for NPG YouTube- conservation of Katherine Parr 
Form Of Engagement Activity Engagement focused website, blog or social media channel
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Public/other audiences
Results and Impact A video was produced, featuring paintings conservator Polly Saltmarsh, to discuss the conservation and technical examination of the portrait of Katherine Parr attributed to Master John. The video covered the discovery of the pigment fluorite using microscopy and the examination of underdrawing using infrared reflectoraphy- both facilitated by equipment purchased with the AHRC CapCo grant. The video has been viewed 1.5k times on the NPG YouTube channel. The video was used in promotional material for the exhibition 'Tudors' at the Walker Art Gallery, Liverpool. The video was shared on Instagram where it was viewed 8.552 times and was commented upon 14 times.
Year(s) Of Engagement Activity 2022
URL https://youtu.be/1cyf-00OI-4