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Fix yuv factors in palette normalization. The web is full of errors...

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This commit is contained in:
Couriersud 2011-02-06 23:36:17 +00:00
parent 63e1cde4e8
commit 8e97bca711
1 changed files with 7 additions and 7 deletions
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14
src/lib/util/palette.c
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@ -682,8 +682,8 @@ void palette_group_set_contrast(palette_t *palette, UINT32 group, float contrast
void palette_normalize_range(palette_t *palette, UINT32 start, UINT32 end, int lum_min, int lum_max) void palette_normalize_range(palette_t *palette, UINT32 start, UINT32 end, int lum_min, int lum_max)
{ {
UINT32 ymin = 1000 * 255, ymax = 0; INT32 ymin = 1000 * 255, ymax = 0;
UINT32 tmin, tmax; INT32 tmin, tmax;
UINT32 index; UINT32 index;
/* clamp within range */ /* clamp within range */
@ -708,12 +708,12 @@ void palette_normalize_range(palette_t *palette, UINT32 start, UINT32 end, int l
{ {
rgb_t rgb = palette->entry_color[index]; rgb_t rgb = palette->entry_color[index];
INT32 y = 299 * RGB_RED(rgb) + 587 * RGB_GREEN(rgb) + 114 * RGB_BLUE(rgb); INT32 y = 299 * RGB_RED(rgb) + 587 * RGB_GREEN(rgb) + 114 * RGB_BLUE(rgb);
INT32 u = ((INT32)RGB_BLUE(rgb)-y /1000)*565 / 1000; INT32 u = ((INT32)RGB_BLUE(rgb)-y /1000)*492 / 1000;
INT32 v = ((INT32)RGB_RED(rgb)-y / 1000)*713 / 1000; INT32 v = ((INT32)RGB_RED(rgb)-y / 1000)*877 / 1000;
INT32 target = tmin + ((y - ymin) * (tmax - tmin + 1)) / (ymax - ymin); INT32 target = tmin + ((y - ymin) * (tmax - tmin + 1)) / (ymax - ymin);
UINT8 r = rgb_clamp(target + 1403 * v / 1000); UINT8 r = rgb_clamp(target + 1140 * v / 1000);
UINT8 g = rgb_clamp(target - 344 * u / 1000 - 714 * v / 1000); UINT8 g = rgb_clamp(target - 395 * u / 1000 - 581 * v / 1000);
UINT8 b = rgb_clamp(target + 1770 * u / 1000); UINT8 b = rgb_clamp(target + 2032 * u / 1000);
palette_entry_set_color(palette, index, MAKE_RGB(r, g, b)); palette_entry_set_color(palette, index, MAKE_RGB(r, g, b));
} }
} }