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libgimpcolor: gimp_color_is_perceptually_identical() also checks transparency.

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When I implemented CIEDE2000 distance for verifying perceptual identity,
I mistakenly lost checking the alpha channel.
This commit is contained in:
Jehan 2023-12-21 15:55:52 +09:00
parent b53da69f3c
commit d1c3b104bf
1 changed files with 10 additions and 0 deletions
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10
libgimpcolor/gimpcolor.c
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@ -122,9 +122,19 @@ gboolean
gimp_color_is_perceptually_identical (GeglColor *color1,
GeglColor *color2)
{
gdouble a1;
gdouble a2;
g_return_val_if_fail (GEGL_IS_COLOR (color1), FALSE);
g_return_val_if_fail (GEGL_IS_COLOR (color2), FALSE);
gegl_color_get_rgba (color1, NULL, NULL, NULL, &a1);
gegl_color_get_rgba (color2, NULL, NULL, NULL, &a2);
/* With different transparency, don't look further. */
if (ABS (a1 - a2) > 1e-4)
return FALSE;
/* All CIE deltaE distances were designed with a 1.0 JND (Just Noticeable
* Difference), though there was some revision to 2.3 for the CIE76 version.
* I could not find a reliable source about whether such a revision happened