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July 1, 2011 04:01 am PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/mKHMsOfu9hg/restoring-a-badly-da.html
Restoring a badly damaged 1870s tintype
Bob Rosinsky from Top Dog Imaging walks through the extraordinary process of restoring a badly damaged 1870s tintype (such as the Billy the Kid image that was the subject of a recent record-setting auction) using modern, high-tech techniques, such as a polarized strobe and ultra-high-rez camera. He hints at even more advanced techniques employing X-rays, UV and infra-red light. My standard operating procedure is to use an ultra-high resolution camera combined with a top-of-the-line macro lens to photograph tintypes. I use strobe lights to illuminate the artwork. Strobes produce "hard" light, much like the sun on a clear day. In addition to the strobes, I place a polarizer over the camera lens and polarizer gels over the strobe lights. This eliminates all reflections and enables the camera to pick up a greater tonal range along with more detail... One advantage of using a scanner to digitize a tintype is that it will smooth out surface imperfections and micro details thus reducing the amount of time it takes the retouch artist to produce a clean, albeit low fidelity, image -- somewhat analogous to hearing a Beethoven symphony on AM radio. Restoring a Photograph from the 1870s (via Kottke)...
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/mKHMsOfu9hg/restoring-a-badly-da.html
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