I'll trying to find out what happens when a layer is in subtract mode 
with a global opacity not one or zero (i.e. what computations are done 
with the pixels values of the composite image of the layers below, the 
pixel values of the layer, and the general opacity). I have a git 
extract of the Gimp source code (and of gegl & babl) but got lost... Can 
someone help?
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