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Description
magick ../test.png -gamma -1,-1,0 -alpha off yellow_gamma.png
taken from https://usage.imagemagick.org/canvas/ does not produce all-yellow image, but rather all-white one.
Or
magick ../test.png -channel red -gamma -1 -channel green -gamma -1 -channel blue -gamma 0 -alpha off yellow_gamma.png
produces
Similar to ImageMagick/ImageMagick#1151.
Tested with 7.1.1-43.
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