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libavfilter/vf_colorspace.c: fix demarcation point of gamma linearize function 

The linearize function (usually refered to EOTF) is the inverse of
delinearize function (usually referred to OETF). Demarcation point of
EOTF should be beta*delta, but the actual value used now in the source
code is beta.

For ITU Rec.709, they are 0.081 (0.018*4.5) and 0.018 respectively
(beta = 0.018 and delta = 4.5), and they correspond to pixel value 5
and 21 for an 8-bit image. Linearized result of pixel within that range
(5-21) will be different, but this commit will make linearize function
of the filter more accurate in the mathematical sense.

Signed-off-by: Yonglin Luo <vincenluo@tencent.com>
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
This commit is contained in:
Yonglin Luo 2019-07-03 10:05:36 +08:00 committed by Vittorio Giovara
parent 1ac643f066
commit 664a27ea40
1 changed files with 2 additions and 2 deletions
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4
libavfilter/vf_colorspace.c
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@ -260,9 +260,9 @@ static int fill_gamma_table(ColorSpaceContext *s)
s->delin_lut[n] = av_clip_int16(lrint(d * 28672.0));
// linearize
if (v <= -in_beta) {
if (v <= -in_beta * in_delta) {
l = -pow((1.0 - in_alpha - v) * in_ialpha, in_igamma);
} else if (v < in_beta) {
} else if (v < in_beta * in_delta) {
l = v * in_idelta;
} else {
l = pow((v + in_alpha - 1.0) * in_ialpha, in_igamma);