If the document's color space is significantly different from the viewport's sRGB space, the OpenGL cached animation playback has strange colors. For example with a CMYK space it's totally messed. I think a final color space conversion is missing somewhere.
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this was observed by @sketchstick as well, but this also needs a bug in bugs.kde.org. The cache is proly not colour managed no.
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A possible solution I think, to use the cache only if the color space matches enough (ie. it's well usable in all RGB spaces with minor color distortions) and to use the cacheless redrawing otherwise.
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That'd be a bullshit solution, because that would mean krita isn't usable outside of srgb space. Linear has the same issue.
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The cache is not color managed probably to increase the rendering speed. The playback in CMYK space is pure garbage, I think because of the extra colour channel. But CMYK has no meaning in the film industry. XYZ space can be important for cinema quality animations (DCP) . What is the best solution then, to add a color space conversion ?
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I am 90% sure the cache is not colormanaged because it was forgotten to be colour managed.
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As far as I remember the color conversion of the cache should have happened in a different thread (there was a bug related to it). So it might got broken somewhere.