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Set gamma correction curve (not only the exponent of a power law)

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xgamma and kgamma allows one to alter the gamma correction curve by changing the exponent of a power-law expression original image:

power-law expression

Some programs and video cards allows one to alter this curve with more flexibility, by setting many points on it. This and this tests show that a power-law expression may not be good enough for some computers, and that is my case.

Is there any program for Linux that allows one to alter the gamma correction curve with more flexibility than a power law? I am using KDE and an Intel Iris Xe card.

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