https://bugs.kde.org/show_bug.cgi?id=474583
Bug ID: 474583
Summary: Swatchbooker CMYK color palette may be rendered
incorrectly
Classification: Applications
Product: krita
Version: 5.2.0-rc1
Platform: Other
OS: Other
Status: REPORTED
Severity: minor
Priority: NOR
Component: File formats
Assignee: krita-bugs-n...@kde.org
Reporter: cmyk.stud...@gmail.com
Target Milestone: ---
Created attachment 161652
--> https://bugs.kde.org/attachment.cgi?id=161652&action=edit
Swatchbooker palette loaded in GIMP, with Cyan row highlighted
GIMP recently added support for importing Swatchbooker color palettes. While
comparing the results with Krita, I noticed that Krita might be rendering the
CMYK colors incorrectly. In the sample file from the Swatchbooker repository,
there is a row of "Cyan (%)" colors that are in the CMYK color space. In GIMP,
these show up as Cyan (see attached image). In Krita, they show up as white.
Swatchbooker stores the CMYK percentages as floating point (0.0 to 1.0). I
think what's happening is that Krita is treating those as 0.5% rather than
multiplying them to get 50.0%
The relevant code for Krita is at
https://invent.kde.org/graphics/krita/-/blob/master/libs/pigment/resources/KoColorSet.cpp#L1832
(Note that Krita does have a test .sbz file at
https://invent.kde.org/graphics/krita/-/blob/master/libs/pigment/tests/data/swatchbook.sbz,
but the "CMYK" palette is commented out from the Swatchbooker site example and
replaced with RGB).
STEPS TO REPRODUCE
1. Download a valid .sbz file with a CMYK color palette
(https://github.com/olivierberten/SwatchBooker/blob/master/data/sample.sbz)
2. Import into Krita
3. Look at the "Cyan" colors in the palette
OBSERVED RESULT
The "Cyan" colors appear to be white
EXPECTED RESULT
The "Cyan" colors should be Cyan
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