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Answers
Well, where this mode comes from and what is it supposed to do?
@PhiLho I develop flash games in AS3. This is the description from adobe reference doc "Applies the alpha value of each pixel of the display object to the background." we usualy use it to erase the background. So whats the equivalent in processing.
If you erase the background, what appears behind it? I never used AS3 / Flash, that's why I ask.