Today Barron demonstrated to me a prototype system that can take an archival scanned plate (even of poor quality) and figure out the photographic emulsion with which it was taken. He uses the brightness ranking of the sources in the image, which is not completely trivial given the strong saturation in scanned photographic plates. We are close to our evil plan of being able to reconstruct all calibration meta-data for any image in any state of archival laxity.
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