[Gimp-developer] Compositing function "nachbelichten"

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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
-- 
Think, think different. But essentially: Think!

ps: don't worry, i'm not working on some kind of counter program, but i want 
to use this function to highlight something in my app.

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