diff options
Diffstat (limited to 'video')
| -rw-r--r-- | video/out/gl_lcms.c | 22 | ||||
| -rw-r--r-- | video/out/gl_lcms.h | 1 |
2 files changed, 17 insertions, 6 deletions
diff --git a/video/out/gl_lcms.c b/video/out/gl_lcms.c index a6f30e0126..6fd86d9874 100644 --- a/video/out/gl_lcms.c +++ b/video/out/gl_lcms.c @@ -73,6 +73,7 @@ const struct m_sub_options mp_icc_conf = { OPT_STRING("icc-profile", profile, 0), OPT_STRING("icc-cache", cache, 0), OPT_INT("icc-intent", intent, 0), + OPT_FLAG("icc-approx-gamma", approx, 0), OPT_STRING_VALIDATE("3dlut-size", size_str, 0, validate_3dlut_size_opt), {0} }, @@ -164,13 +165,22 @@ struct lut3d *mp_load_icc(struct mp_icc_opts *opts, struct mp_log *log, .Blue = {0.15, 0.06, 1.0}, }; - /* Rec BT.709 defines the tone curve as: - V = 1.099 * L^0.45 - 0.099 for L >= 0.018 - V = 4.500 * L for L < 0.018 - - The 0.081 parameter comes from inserting 0.018 into the function */ - cmsToneCurve *tonecurve = cmsBuildParametricToneCurve(NULL, 4, + cmsToneCurve *tonecurve; + if (opts->approx) { + /* Apple's CMS, among other programs that rely on it, uses 1.95 as a + faster approximation of this curve. It's not quite correct, but the + option is provided for compatibility with such incorrect clips. */ + tonecurve = cmsBuildGamma(NULL, 1.95); + } else { + /* Rec BT.709 defines the tone curve as: + V = 1.099 * L^0.45 - 0.099 for L >= 0.018 + V = 4.500 * L for L < 0.018 + + The 0.081 parameter comes from inserting 0.018 into the function */ + tonecurve = cmsBuildParametricToneCurve(NULL, 4, (cmsFloat64Number[5]){1/0.45, 1/1.099, 0.099/1.099, 1/4.5, 0.081}); + } + cmsHPROFILE vid_profile = cmsCreateRGBProfile(&d65, &bt709prim, (cmsToneCurve*[3]){tonecurve, tonecurve, tonecurve}); cmsFreeToneCurve(tonecurve); diff --git a/video/out/gl_lcms.h b/video/out/gl_lcms.h index a579b78f43..4a8e0cfb6a 100644 --- a/video/out/gl_lcms.h +++ b/video/out/gl_lcms.h @@ -8,6 +8,7 @@ struct mp_icc_opts { char *cache; char *size_str; int intent; + int approx; }; struct lut3d; |