You obviously have a point here, the current implementation does not do what the word "substact" implies.

Before considering a fix: any idea how the "substract" operator should act in the Lab color space?

Ulrich

Am 05.03.2018 um 22:46 schrieb Matthieu Moy:
----- Original Message -----
There is a link in the documentation to a gimp doc page that explains it, and
some modes are explained in the darktable docs.

https://www.darktable.org/usermanual/en/blending_operators.html
https://docs.gimp.org/2.8/en/gimp-concepts-layer-modes.html

Yes, I did read both documents. But the "subtract" operator of darktable does 
not do what the Gimp page describes, and there's no specific doc for it in dt's doc.

My question comes from the fact that "subtract" is suspiciously closer to "add" 
than what I'd expect from from the name (and from Gimp's doc).


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