I have now managed to add spectral blending to krita’s KoMixColorsOp, which means that spectral blending can be used for gradients, picker sampling and smudge brush sampling, I will submit them if I have time after the spectral blending mode performance issues have been resolved and merged, but there are still a lot of issues that need to be resolved, at the moment spectral blending only works with linear profiles, maybe Perhaps a confirmation option could be added, such as using spectra for picker sampling and smudge brush sampling when the profile is linear RGB, or maybe a separate tool setting could be added? My code level is too low to implement them
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