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Compositing function "nachbelichten"

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Compositing function "nachbelichten" Thomas Lübking 18 Mar 00:13
Thomas Lübking
2004-03-18 00:13:03 UTC (about 20 years ago)

Compositing function "nachbelichten"

Hi.
I'm interested how the composite fuction "after light???" (my gimp talks german to me - so it's "nachbelichten" - i think i should be dodge?!?) works.
I checked the code, but the function (A * 256) / (256 - B)
doesn't seem to be the proper one (as e.g. overlaying a picture with a white color (A) in this mode doesn't change the picture (B) anyway) If anyone could tell me, how this is done, or where i can find the proper code:
Thanks

Thomas