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tests: image: fix conversion from RGB to YUV.

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Fix RGB to YUV conversion to preserve full data range.
This commit is contained in:
Gwenole Beauchesne 2013-08-23 16:25:39 +02:00
parent 73323ba76a
commit dd6a0d87ff
1 changed files with 3 additions and 3 deletions
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6
tests/image.c
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@ -276,9 +276,9 @@ static inline guint32 argb2yuv(guint32 color)
const gint32 g = (color >> 8) & 0xff;
const gint32 b = (color ) & 0xff;
const guint32 y = (( 263 * r + 516 * g + 100 * b) >> 10) + 16;
const guint32 u = ((-152 * r - 298 * g + 450 * b) >> 10) + 128;
const guint32 v = (( 450 * r - 376 * g - 73 * b) >> 10) + 128;
const guint32 y = (( 306 * r + 601 * g + 116 * b) >> 10);
const guint32 u = ((-172 * r - 339 * g + 512 * b) >> 10) + 128;
const guint32 v = (( 512 * r - 428 * g - 83 * b) >> 10) + 128;
return (y << 16) | (u << 8) | v;
}