I believe you're asking for http://bugzilla.gnome.org/show_bug.cgi?id=325564
<http://bugzilla.gnome.org/show_bug.cgi?id=325564>which has been addressed when using GEGL. Seth 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 > improvement. > In short, the Color and Value blending, transfer modes in GIMP do not work > as > they should. The problem is compounded by the fact that there seems to be > no > application on Linux where these transfer modes work correctly. In fact, > it > seems all the major applications use the same or very similar algorithms. > So > the problem is the same in Krita (which uses GEGL as far as I know) and in > ImageMagick. > > 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 > the > case, the result worsens the luminance noise! If you have trouble seeing > this, > zoom into the image up to 400% or try an image with more obvious noise. > Also, > try increasing the blur factor. > > Now by comparison, repeat the experiment in Photoshop. You won't fail to > notice > that in Photoshop this works correctly. The colours are more muted, > perhaps > '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 > also > at play if instead of layer blending, the blending is done in the Fade > command > dialog. > > 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 > will > 2.8, but I doubt that will in itself offer the solution, because Krita is > using > GEGL and the problem there is the same. > > Thank you for listening and good luck with the coding. > > Charlie > > > > > _______________________________________________ > Gimp-developer mailing list > Gimp-developer@lists.XCF.Berkeley.EDU > https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer >
_______________________________________________ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
