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magick -gamma -1,-1,0 does not produce all-yellow image #9

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@pgajdos

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@pgajdos
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

yellow_gamma

Similar to ImageMagick/ImageMagick#1151.

Tested with 7.1.1-43.

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