mandag den 5. marts 2018 21.52.41 CET skrev Matthieu Moy: > Hi, > > I'm wondering what the "subtract" blend mode is supposed to do. > > Looking at the source code, when opacity is 1 and ignoring clamping, the > formula seems to be roughly "b + a - 1". That looks very much like a "add" > operator more than a "subtract". > > Actually, looking at the Git history, commit > https://github.com/darktable-org/darktable/commit/52b057dec32ea62c62f4c968a > 216bebf8ae89c92 turned the formula from "a-b" to essentially "b+a-max". > > This looks like a bug introduced a long time ago, unnoticed because no one > really use this operator. Is it the case? If not, what did I miss? > > Thanks,
Hi, 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 Kindly, Anders ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
