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

[Øyvind Kolås <pippin gimp org>]

On Tue, Oct 10, 2017 at 10:36 AM, Elle Stone
<ellestone ninedegreesbelow com> wrote:
> 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:

These messages are debug messages, informing us that GIMP tried to
create dedicated babl_formats from the ICC profiles, babl detected
that it is a type of ICC profile it is not capable of handling, thus
GIMPs attempt at creating a babl based format (and thus conversions)
failed. GIMP will then instead use lcms2 for conversions to/from the
color space of the ICC profile.

The same happens when GIMP tries to rig up conversions to/from a color
space in its perceptual intent instead of relative colorimetric *and*
perceptual intent is defined with 3D CLUTs in the ICC profile, babl
gives up, GIMP notices, and uses lcms2 instead of babl for
conversions.

If when/additional capabilities get added to babl GIMP will
automatically be using babl for more conversions. Calling this an
error isn't entirely correct though, it should be a warning.

/pippin