Library of Congress – Spectral Imaging Research and Metrics

Background and History

In May 2017, Avian Rochester began a third project with the Library of Congress (LC). This project moved away from specific NGT efforts, and began a discussion of the application of spectral imaging within the library and museum communities. The details of this project, formally (and somwewhat generically) entitled “FADGI Color Consultation services,” are below. For those unfamiliar with FADGI (Federal Agencies Digital Guidelines Initiative), this is from their website:

FADGI is a collaborative effort started in 2007 by federal agencies to articulate common sustainable practices and guidelines for digitized and born digital historical, archival and cultural content. Two working groups study issues specific to two major areas, Still Image and Audio-Visual.

Report on research into spectral imaging prior art and best practice

As the title implies, this is a research review of various spectral imaging technologies. It begins with the state of the art at LC, and then expands to the general spectral imaging field. The report is not exhaustive, but rather focuses on technologies that might be applicable to the current and near-term digitization efforts at LC. (full report).

New metrics and processes for applying spectral analysis to FADGI

The focus here was to determine a method of improving the color accuracy of the Metis large format flatbed scanner in use within the Prints and Photographs area of the Library of Congress. After reviewing the technical details of the Metis scanner and its current shortfalls, general techniques for spectral imaging are mentioned. Finally, one simple technique is proposed which should provide immediate improvement while more involved solutions are expored. (full report).


These reports set the stage for a continuing effort of moving the LC closer to a spectral imaging workflow.

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