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vo_opengl: fix typo in gamma function's parameter 

The correct value is 0.081, not 0.18. The scale factor also needed
slight adjustment due to the order of operations.
This commit is contained in:
nand 2014-02-10 17:28:49 +01:00 committed by wm4
parent 1fcdf2d849
commit 7d9fff9c6b
1 changed files with 2 additions and 2 deletions
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video/out/gl_lcms.c
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@ -168,9 +168,9 @@ struct lut3d *mp_load_icc(struct mp_icc_opts *opts, struct mp_log *log,
V = 1.099 * L^0.45 - 0.099 for L >= 0.018
V = 4.500 * L for L < 0.018
The 0.18 parameter comes from inserting 0.018 into the function */
The 0.081 parameter comes from inserting 0.018 into the function */
cmsToneCurve *tonecurve = cmsBuildParametricToneCurve(NULL, 4,
(cmsFloat64Number[5]){1/0.45, 1/1.099, 0.099, 1/4.5, 0.18});
(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);