Color Harmony with RYB

priort · September 23, 2023, 11:23pm

I am not really sure if this issue about how DT reports color in the colorpicker and thus the scopes as well was ever really sorted …it may…

There were are few threads around this

github.com/darktable-org/darktable

global color picker accuracy

opened 06:27PM - 12 Aug 22 UTC

closed 12:18AM - 09 Jan 24 UTC

douzzer

no-issue-activity

In #3271 and darktable-org/dtdocs#188, it was clarified that >As the global c…olor picker runs at the end of the preview pixelpipe, it receives data in display color space then converts it to histogram color space. If you are using a display color space which is not “well behaved” (this is common for a device profile), then colors that are outside of the gamut of the display profile will clip or distort. However, I am finding (using DT4) that colors are distorted regardless of relationship to display gamut. Specifically, if I pick colors from a numerically-generated grayscale gradient, the picker shows the correct R==G==B values only if I override the display profile with an ideal profile (e.g. the builtins like sRGB, AdobeRGB, ProPhoto, etc.). With the physically measured display profile, there is deviation on all of the reported values, even though they are all well within gamut (gamut check on the display profile shows nothing out of gamut). It seems awkward and fidgity to try to undo the display profile to get at the actual color, and it seems to me the only way to avoid these troubles is to have the global color picker jack into the pipeline earlier, when the data is still in the working space and untruncated.

and

If it has then you can trust color values I would assume but if not there could be linear / non linear issues at times as well…