Thanks for the thorough explanations... The "probabilistic" point of view is interesting. Your write-up makes a load of sense but some more time is required for this to completely sink in:) On 8/18/19 9:35 AM, Ell via gimp-developer-list wrote:
There's indeed no organized documentation for all the new layer modes yet, unfortunately. For Pass Through mode, see: https://docs.gimp.org/2.10/en/glossary.html#glossary-pass-through Merge and Split are complementary modes, as their names suggest. They are similar to Normal and Erase modes, respectively, but they handle alpha values differently. The short version is that (when using their default composite modes) Merge adds the alpha values of the input layers, while Split subtracts them. In other words, if the alpha values of the bottom and top layers are A and B, respectively, the resulting alpha values for Merge and Split are `min (A + B, 100%)` and `max (A - B, 0%)`, respectively. --- Wall-of-text warning. Skip to the end for practical examples. --- [.. snip ..]
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