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libgimpcolor: change LUMINANCE Y values to match sRGB built-in profile

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This commit is contained in:
Elle Stone
2015-02-07 12:20:36 -05:00
committed by Michael Natterer
parent 48a8104037
commit 3925466db5
1 changed files with 8 additions and 8 deletions
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16
libgimpcolor/gimprgb.h
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@ -179,19 +179,19 @@ gdouble gimp_rgba_distance (const GimpRGB *rgba1,
/* Map RGB to intensity */
/* Map D50-adapted sRGB to luminance */
/*
* The weights to compute true CIE luminance from linear red, green
* and blue, as defined by the ITU-R Recommendation BT.709, "Basic
* Parameter Values for the HDTV Standard for the Studio and for
* International Programme Exchange" (1990). Also suggested in the
* sRGB colorspace specification by the W3C.
* and blue as defined by the sRGB color space specs in an ICC profile
* color managed application. The weights below have been chromatically
* adapted from D65 (as specified by the sRGB color space specs)
* to D50 (as specified by D50 illuminant values in the ICC V4 specs).
*/
#define GIMP_RGB_LUMINANCE_RED (0.2126)
#define GIMP_RGB_LUMINANCE_GREEN (0.7152)
#define GIMP_RGB_LUMINANCE_BLUE (0.0722)
#define GIMP_RGB_LUMINANCE_RED (0.22248840)
#define GIMP_RGB_LUMINANCE_GREEN (0.71690369)
#define GIMP_RGB_LUMINANCE_BLUE (0.06060791)
#define GIMP_RGB_LUMINANCE(r,g,b) ((r) * GIMP_RGB_LUMINANCE_RED + \
(g) * GIMP_RGB_LUMINANCE_GREEN + \