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Is it possible to do gamma change in RGB color space?

ffmpeg -i video.mkv -vf eq=gamma=1.2 video1.mkv

Where to put the "converttoRGB" "converttoyuv" ?

(Changing gamma in YUV causes problems with saturation)

OK - here is the answer:

-vf lutrgb=r=gammaval(0.75):g=gammaval(0.75):b=gammaval(0.75) ^
-c:v libx264 -pix_fmt yuv420p -preset ultrafast -crf 17

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