The Behind blending mode has a problem (at least) in 16 bit integer channel mode, probably because of mixing signed and unsigned integer calculations. The blended color turns into its inverse at near-transparent areas. This modified version works without this problem.
Details
Details
Open a canvas with 16 bits integer channels and draw on a transparent layer with some colors in the Behind drawing mode. It's best to use some blurred tool like the airbrush. If you cross a different color stroke, you can see inverse colors at the edges (Linux, x86_64).
Diff Detail
Diff Detail
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- R37 Krita
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This patch looks good to me, though I haven't been able to test it yet.
dmitry is a bit better in regards to the effect of the maths, so I am adding him as reviewer.
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Hi, @fazek!
Thank you for the patch! I tested it on int8, int16, float16 and float32 and it works fine. Now we can push it into master. Do you have KDE commit rights? Or I should push the patch for you? If the latter is true, I need your email address to keep your authorship over the commit :)
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@dkazakov Thanks. I don"t have the rights yet, so feel free to push it yourself.
I don't know what are the rules about email addresses in open text here, so I sent you an email with my address, I'm the same guy from the developer maillist who wants to add the CSV file format support.
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dmitry just pushed it! Congratulations on your first commit! (When you have 3 commits, we can get you contributor rights)
(Also, come say hi on irc)