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Interesting. Of course, the iconoscope (or equivalent) cameras used early-on were inherently AC coupled and had a floating black level anyway. It is conceivable (not sure if it was done) to clamp on the dark parts of the image; This would prevent shadows going blacker than black, but would make the darkest areas black even if they were really gray.
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Old TV literature, New York World's Fair, and other miscellany
Last edited by old_tv_nut; 02-10-2020 at 04:23 PM.
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