I found the algorithms of many merging mode
BUT all the the formula there do not take opacity into account so as now the blending may be done only at 100% opacity
(btw is for a "blending filter" , that allow to merge also in mode not available in Gimp
obviously the result, the output is the visible from the the merging as new layer )
I'm sure somewhere in the Gimp code or documentation there is the answer:
how ,mathematically variation of opacity are taken into account, but i am really lost in front of page of codes and doc
could someone ( help me, pointing to a specific page or speciphic doc
Also i need help to find found the algorithms and doc on modes as "erase" "color erase"" behind" (available for Edit/fade) and "grain extract" "grain merge" ?
Any help or pointer will be really appreciated
thank
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