[gimp] Revert "libgimpcolor: use D50 for the gray profiles"

[Michael Natterer <mitch src gnome org>]

commit 822bfabe212cd71ce124145f6ae99eafdcc95e83
Author: Michael Natterer <mitch gimp org>
Date:   Mon Dec 14 18:43:26 2015 +0100

    Revert "libgimpcolor: use D50 for the gray profiles"
    
    This reverts commit 169f436e7567cd025dbdb29614b5c7e6f2cff85d.
    
    Turns out we should use the same whitepoint for RGB and GRAY.

 libgimpcolor/gimpcolorprofile.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/libgimpcolor/gimpcolorprofile.c b/libgimpcolor/gimpcolorprofile.c
index dcd8d2f..785802d 100644
--- a/libgimpcolor/gimpcolorprofile.c
+++ b/libgimpcolor/gimpcolorprofile.c
@@ -1212,8 +1212,8 @@ gimp_color_profile_new_srgb_gray_internal (void)
 {
   cmsHPROFILE profile;
 
-  /* white point is D50 */
-  cmsCIExyY whitepoint = { 0.345702915, 0.358538597, 1.0 };
+  /* white point is D65 from the sRGB specs */
+  cmsCIExyY whitepoint = { 0.3127, 0.3290, 1.0 };
 
   cmsFloat64Number srgb_parameters[5] =
     { 2.4, 1.0 / 1.055,  0.055 / 1.055, 1.0 / 12.92, 0.04045 };
@@ -1274,8 +1274,8 @@ gimp_color_profile_new_linear_gray_internal (void)
 {
   cmsHPROFILE profile;
 
-  /* white point is D50 */
-  cmsCIExyY whitepoint = { 0.345702915, 0.358538597, 1.0 };
+  /* white point is D65 from the sRGB specs */
+  cmsCIExyY whitepoint = { 0.3127, 0.3290, 1.0 };
 
   cmsToneCurve *curve = cmsBuildGamma (NULL, 1.0);