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avfilter/paletteuse: fix error dithering accuracy

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This commit is contained in:
Clément Bœsch
2015-02-18 11:17:10 +01:00
parent 29bbc1be48
commit b0f5227558
1 changed files with 3 additions and 3 deletions
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6
libavfilter/vf_paletteuse.c
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@@ -133,9 +133,9 @@ static int query_formats(AVFilterContext *ctx)
static av_always_inline int dither_color(uint32_t px, int er, int eg, int eb, int scale, int shift) static av_always_inline int dither_color(uint32_t px, int er, int eg, int eb, int scale, int shift)
{ {
return av_clip_uint8((px >> 16 & 0xff) + ((er * scale) >> shift)) << 16 return av_clip_uint8((px >> 16 & 0xff) + ((er * scale) / (1<<shift))) << 16
| av_clip_uint8((px >> 8 & 0xff) + ((eg * scale) >> shift)) << 8 | av_clip_uint8((px >> 8 & 0xff) + ((eg * scale) / (1<<shift))) << 8
| av_clip_uint8((px & 0xff) + ((eb * scale) >> shift)); | av_clip_uint8((px & 0xff) + ((eb * scale) / (1<<shift)));
} }
static av_always_inline int diff(const uint8_t *c1, const uint8_t *c2) static av_always_inline int diff(const uint8_t *c1, const uint8_t *c2)