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FOSS monitor calibrator?
(kbin.social)
Gamma can be adjusted with xrandr.
If you want to do a proper color calibration, lookup "color management" for your distro or desktop environment. You can load an ICC color profile, but you will need a colorimeter or spectrometer to create one.
see idc about it being color accurate, just looking a big better. gamma is the main issue tho, so thanks