s ver wrote:

Digital photos taken from microfilm equipment in public libraries typically come up with inequality in brightness due to imperfect condenser lenses. Gives a bright center and dark corners. (sample at http://users.telenet.be/spica/trial/microfilm.jpg).
Has anyone a filter to correct this?
The "Correct->Radial Luminance" filter of Panorama Tools could be
helpful in your case.
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