I believe you're asking for
<http://bugzilla.gnome.org/show_bug.cgi?id=325564>which has been addressed
when using GEGL.
On Mon, Jul 26, 2010 at 6:33 AM, Charlie De <charlieco...@yahoo.com> wrote:
> Hello all,
> I've joined up with this list to make an important suggestion for
> In short, the Color and Value blending, transfer modes in GIMP do not work
> they should. The problem is compounded by the fact that there seems to be
> application on Linux where these transfer modes work correctly. In fact,
> seems all the major applications use the same or very similar algorithms.
> the problem is the same in Krita (which uses GEGL as far as I know) and in
> To confirm the problem, try this:
> * Open an image in GIMP, preferrably one that has noticeable noise, and the
> noise should be coloured, not merely monochromatic.
> * Duplicate the image into a new layer and blur it, say by 5 points.
> * Set the transfer mode of the blurred layer to Color.
> What should happen is that the colour component of the noise should be
> eliminated, but the luminance/value should remain the same. This is not
> case, the result worsens the luminance noise! If you have trouble seeing
> zoom into the image up to 400% or try an image with more obvious noise.
> try increasing the blur factor.
> Now by comparison, repeat the experiment in Photoshop. You won't fail to
> that in Photoshop this works correctly. The colours are more muted,
> 'leaking' over colour boudaries, but the luma noise is not made worse.
> The same effect is at play the other way round, if Value is used instead of
> Color (and it's the bottom layer that is blurred). And the same effect is
> at play if instead of layer blending, the blending is done in the Fade
> In short, there is no correct way yet of using these transfer modes on
> Linux and
> a proper solution is desperately needed.
> By the way, I'm using GIMP 2.6.8. I appreciate that 2.7.1 is using GEGL as
> 2.8, but I doubt that will in itself offer the solution, because Krita is
> GEGL and the problem there is the same.
> Thank you for listening and good luck with the coding.
> Gimp-developer mailing list
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