Benau 09e2f96ba8 Remove libpng's png_set_gamma
Stragus suggested:

It will degrade quality by converting from true sRGB to ^2.2 and
then rounding the values back on 8 bits
2017-03-17 13:19:56 +08:00
..
2017-03-17 13:19:56 +08:00