[Gimp-developer] Odd "error making format" regarding grayscale ICC profiles

[Elle Stone <ellestone ninedegreesbelow com>]

Hi,

In recent versions of GIMP-2.9 there are some odd "error making format" 
messages printed to the terminal when opening a grayscale image, 
converting to Grayscale mode, converting to a grayscale profile from 
disk, and adding a layer mask.

The "error making format" messages are accompanied by the information 
that grayscale color spaces aren't RGB color spaces, which of course is 
true. Despite the reported errors, there doesn't seem to be any actual 
problems with how GIMP handles grayscale images. Here are some examples:

* Adding a layer mask (ignore the intervening "WARNING" lines):

gimp_color_transform_new: error making format: GIMP built-in D65 Linear 
Grayscale: not defining an RGB space
*WARNING* missing babl fast path(s): "cairo-RGB24" to "R'G'B' u8"
*WARNING* missing babl fast path(s): "Y float" to "Y double"
gimp_color_transform_new: error making format: GIMP built-in D65 Linear 
Grayscale: not defining an RGB space

* Opening a grayscale XCF that's in GIMP's built-in linear gamma gray 
color space:

gimp_color_transform_new: error making format: GIMP built-in D65 Linear 
Grayscale: not defining an RGB space
gimp_color_transform_new: error making format: GIMP built-in D65 Linear 
Grayscale: not defining an RGB space
gimp_color_transform_new: error making format: GIMP built-in D65 Linear 
Grayscale: not defining an RGB space

* Converting to a grayscale profile from disk:

gimp_color_transform_new: error making format: Gray-elle-V4-labl.icc: 
not defining an RGB space
gimp_gegl_convert_color_profile: converting buffer took 0.1220 seconds
gimp_color_transform_new: error making format: Gray-elle-V4-labl.icc: 
not defining an RGB space
gimp_color_transform_new: error making format: Gray-elle-V4-labl.icc: 
not defining an RGB space
XXXXXX gimp_image_create_color_transforms XXXXXX
gimp_color_transform_new: error making format: Gray-elle-V4-labl.icc: 
not defining an RGB space
gimp_color_transform_new: error making format: Gray-elle-V4-labl.icc: 
not defining an RGB space
gimp_color_transform_new: error making format: Gray-elle-V4-labl.icc: 
not defining an RGB space
gimp_color_transform_new: error making format: Gray-elle-V4-labl.icc: 
not defining an RGB space

Best,
Elle