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Merge pull request #29 from twpayne/alpha-composite-rounding

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Avoid rounding error in Image.alpha_composite
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Alex Clark ☺ 2013-01-09 03:30:15 -08:00
commit d4c30b7171
1 changed files with 4 additions and 4 deletions
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8
libImaging/AlphaComposite.c
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@ -81,10 +81,10 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc)
}
}
out[x + 0] = (UINT8) (255.0 * outR);
out[x + 1] = (UINT8) (255.0 * outG);
out[x + 2] = (UINT8) (255.0 * outB);
out[x + 3] = (UINT8) (255.0 * outA);
out[x + 0] = (UINT8) (255.0 * outR + 0.5);
out[x + 1] = (UINT8) (255.0 * outG + 0.5);
out[x + 2] = (UINT8) (255.0 * outB + 0.5);
out[x + 3] = (UINT8) (255.0 * outA + 0.5);
}