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avfilter/vf_colorkey: fix formula for calculation of difference

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Also fixes colorhold filtering.
This commit is contained in:
Paul B Mahol 2020-05-16 19:45:53 +02:00
parent f63939dedb
commit 8b0575d763
2 changed files with 11 additions and 11 deletions
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2
libavfilter/vf_colorkey.c
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@ -45,7 +45,7 @@ static uint8_t do_colorkey_pixel(ColorkeyContext *ctx, uint8_t r, uint8_t g, uin
int dg = (int)g - ctx->colorkey_rgba[1];
int db = (int)b - ctx->colorkey_rgba[2];
double diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0));
double diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0 * 3.0));
if (ctx->blend > 0.0001) {
return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;

20
tests/ref/fate/ffmpeg-filter_colorkey
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@ -3,13 +3,13 @@
#codec_id 0: rawvideo
#dimensions 0: 720x576
#sar 0: 0/1
0, 0, 0, 1, 622080, 0x78efb628
0, 1, 1, 1, 622080, 0x641f2564
0, 2, 2, 1, 622080, 0x348f25c3
0, 3, 3, 1, 622080, 0x6afc485a
0, 4, 4, 1, 622080, 0xe949107f
0, 5, 5, 1, 622080, 0x171716e5
0, 6, 6, 1, 622080, 0x2985a01f
0, 7, 7, 1, 622080, 0xc5ddabd7
0, 8, 8, 1, 622080, 0xb4dd2b7f
0, 9, 9, 1, 622080, 0x6e75ba82
0, 0, 0, 1, 622080, 0x5775bb12
0, 1, 1, 1, 622080, 0x84d8395a
0, 2, 2, 1, 622080, 0x599d3a6b
0, 3, 3, 1, 622080, 0x1df1e9dc
0, 4, 4, 1, 622080, 0xf3255836
0, 5, 5, 1, 622080, 0xf46bc26e
0, 6, 6, 1, 622080, 0x76d491da
0, 7, 7, 1, 622080, 0x2c9f3ca6
0, 8, 8, 1, 622080, 0x5713e203
0, 9, 9, 1, 622080, 0x47776493