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Avoid rounding error in Image.alpha_composite

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This commit is contained in:
Tom Payne 2012-12-19 14:25:18 +01:00
parent 0b06bdcb2f
commit 9d35947363
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 + 0] = (UINT8) (255.0 * outR + 0.5);
out[x + 1] = (UINT8) (255.0 * outG); out[x + 1] = (UINT8) (255.0 * outG + 0.5);
out[x + 2] = (UINT8) (255.0 * outB); out[x + 2] = (UINT8) (255.0 * outB + 0.5);
out[x + 3] = (UINT8) (255.0 * outA); out[x + 3] = (UINT8) (255.0 * outA + 0.5);
} }