More consistent srgb transfer #389
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This change shouldn't affect correctness, because the non-mirrored sRGB transfer function is only defined in the interval 0 to 1. However, in some edge cases where images contain YUV data, and extended sRGB transfer function (flipped about 0) has to be used, which was previously handled incorrectly. This is mostly a theoretical concern, though, since I have never seen an image in the wild where negative values actually occurred.
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