Digitizing Paget, Finlay and Dufaycolor photographs at National Geographic Society
Jan Hubička
Early color collection of National Geographic Society consists of over 15,000 plates. In 2020, the Society began the Early Color Photography Conservation and Digitization Project. Probably for the first time a large archive of early color photographs has been digitized in resolution high enough to capture the individual color patches of the mosaic color processes. While the archive consists mostly of Autochromes, in this talk I will focus on processes based on color screen filters with periodically repeating color patterns (Paget and Finlay color plates and Dufaycolor). These presented interesting problems for digitization, since the regular color pattern interferes with the Bayer filter in the camera. The high resolution scans also makes it possible to digitally reconstruct original color and geometry. It also motivated further research about manufacture process of these materials, color dyes used and other interesting aspects of these color processes.
This is a joint work with Mark Jacobs, Linda Kimrová (Charles University), Kenzie Klaeser (Digital Transitions), Sara Manco (National Geographic Society), Doug Peterson (Digital Transitions).
Jan Hubička is an associate professor at the Department of Applied Mathematics, software developer at SUSE LINUX s.r.o. and also a co-founder and a co-director of Šechtl and Voseček Museum of Photography in Tábor, Czech Republic. His interest in early color photography was sparkled by Autochromes taken by his great grandfather, Josef Jindřich Šechtl. In 2006 he organized exhibition of early color photographs by Sergei Mikhailovich Prokudin-Gorsky (first in Europe except for Moscow) for which he made his own tool composing scans of the separation negatives. In 2007 he organized exhibition of (reproductions of) Czech Autochromes which got him into contact with American collector of early color photography, Mark Jacobs. He helped to digitize important part of Mark Jacobs' collection and in 2012 organized exhibition “When the World Turned to Color Early Color Photography from the Mark Jacobs Collection”. Work on regular color screen processes started in 2011 for exhibition of photographs from the American Colony Collection where Mark Jacobs identified negatives for Finlay color process. He also co-orgnized two international workshops on early color photography, "Legacy of three-color phorography" in 2008 and "Space, Color, Motion" in 2013.
Reading
Geoffrey Barker, Jan Hubička, Mark Jacobs, Linda Kimrová, Kendra Meyer, Doug Peterson: Finlay, Thames, Dufay, and Paget color screen process collections: Using digital registration of viewing screens to reveal original color
https://arxiv.org/abs/2211.16076
Jan Hubička, Linda Kimrová, Kenzie Klaeser, Sara Manco, Doug Peterson: Digital analysis of early color photographs taken using regular color screen processes
https://arxiv.org/abs/2309.09631