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| author | nand <nand@lavabit.com> | 2012-12-23 19:49:19 +0100 |
|---|---|---|
| committer | wm4 <wm4@nowhere> | 2012-12-28 13:43:24 +0100 |
| commit | b32f2ef0d344e224a24ed72bf7abf394675ea58f (patch) | |
| tree | a17fed17382267c33866cbaab72d51a5308b4017 /video/out/vo_opengl.c | |
| parent | 6be50fa7736e0095ace5cb1b6e8da35aaa5e52df (diff) | |
| download | mpv-b32f2ef0d344e224a24ed72bf7abf394675ea58f.tar.bz2 mpv-b32f2ef0d344e224a24ed72bf7abf394675ea58f.tar.xz | |
vo_opengl: use more precise gamma for BT.709 with color management
Change from gamma 2.2 to the slightly more precise 1/0.45 as per BT.709.
https://www.itu.int/rec/R-REC-BT.709-5-200204-I/en mentions a value of
γ=0.45 for the conceptual non-linear precorrection of video signals.
This is approximately the inverse of 2.22, and not 2.20 as the code had
been using until now.
Diffstat (limited to 'video/out/vo_opengl.c')
| -rw-r--r-- | video/out/vo_opengl.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/video/out/vo_opengl.c b/video/out/vo_opengl.c index 9e333b90b5..d1808af265 100644 --- a/video/out/vo_opengl.c +++ b/video/out/vo_opengl.c @@ -1908,7 +1908,7 @@ static bool load_icc(struct gl_priv *p, const char *icc_file, .Green = {0.30, 0.60, 1.0}, .Blue = {0.15, 0.06, 1.0}, }; - cmsToneCurve *tonecurve = cmsBuildGamma(NULL, 2.2); + cmsToneCurve *tonecurve = cmsBuildGamma(NULL, 1.0/0.45); cmsHPROFILE vid_profile = cmsCreateRGBProfile(&d65, &bt709prim, (cmsToneCurve*[3]){tonecurve, tonecurve, tonecurve}); cmsFreeToneCurve(tonecurve); @@ -2318,7 +2318,7 @@ static const char help_text[] = " Enable gamma-correct scaling by working in linear light. This\n" " makes use of sRGB textures and framebuffers.\n" " This option forces the options 'indirect' and 'gamma'.\n" -" NOTE: For YUV colorspaces, gamma 2.2 is assumed. RGB input is always\n" +" NOTE: For YUV colorspaces, gamma 1/0.45 is assumed. RGB input is always\n" " assumed to be in sRGB.\n" " pbo\n" " Enable use of PBOs. This is faster, but can sometimes lead to\n" |