Museums and libraries recover historic texts using spectral imaging system
Image credit: Sue Weisler
Libraries and museums in the US have been able to recapture lost and obscured text on historically significant documents using a low-cost spectral imaging system developed by faculty and students at Rochester Institute of Technology (RIT).
The spectral imaging system collects images in many wavelengths of light to reveal faded text that is otherwise undetectable to the human eye. The system was created with funding from the National Endowment for the Humanities by researchers from RIT’s Chester F. Carlson Center for Imaging Science and museum studies program with the goal of providing a practical solution to help curators, archivists and librarians get more out of their collections.
“For years we have been doing this type of work using very large, expensive, complicated and difficult-to-use imaging systems that cost hundreds of thousands of dollars,” said David Messinger, director of the Chester F. Carlson Center for Imaging Science and principal investigator of the grant.
“We developed a low-cost imaging system that is very easy to use so that you don’t need trained scientists or technicians to run the imaging system. This can be run by people that are actively working in the humanities.”
After developing a prototype, the team began testing the system by imaging artefacts held at local collections, including the Genesee Country Village & Museum, the Rochester Public Library and the Rochester Museum & Science Center. This spring, students in Messinger’s cultural heritage imaging class used the system to image artefacts from RIT’s Cary Graphic Arts Collection ranging from 8th-century manuscripts to original comic book artwork. The students discovered that some of the artefacts were palimpsests – manuscripts on parchment where the original writing was scraped or erased for re-use – and recovered text on other artefacts where it had been worn away due to overuse.
The team also sent systems to colleagues at other universities to test and provide feedback. Scholars at Kelvin Smith Library at Case Western Reserve University, Harry Ransom Center at the University of Texas, and the University of Colorado Colorado Springs put the systems to use on artefacts from collections in their regions.
“By now we have three of these systems and the feedback has been awesome,” said Messinger. “The people we have loaned the systems to have used them really well and we appear to be creating some demand for these. Next, we will try to establish a network of people that might be interested in using them, as well as create online materials so others can learn about and have access to these technologies.”
A team of three museum studies students and one imaging science student are continuing to use the system over the summer to image more artefacts and are helping to create parts lists and assembly instructions so that people can build their own systems. They plan to present their findings at RIT’s Undergraduate Research Symposium this summer. Messinger and co-PI Professor Juilee Decker, director of the museum studies program, are now pursuing follow-up grants to further develop education and training materials for other potential users.
“We see the next steps in education and training as critical facets to democratising multispectral imaging and, in turn, providing an on-ramp for discoverability and expanding access to collections,” Decker said.
“We are thrilled to collaborate on this exciting initiative with our students and to share this knowledge with the scholars and professionals working with collections in libraries, archives, and museums.”
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