Hello Gimp Developers, I compiled Gimp, Babl, and Gegl from git (last compilation was June 12, 2012) and did some testing. I posted my findings to a temporary web page: http://ninedegreesbelow.com/temp/gimp29.html I do understand that Gimp 2.9 from git is undergoing heavy development and so it changes frequently. My apologies if I'm reporting on stuff you already know. But here is a summary of what I've found so far: (1) Color space conversions result in lost colors, whether done at 8-, 16-, or 32-bits, floating or integer. At first I thought it was a result of converting to and from a linear-gamma color space. But actually the color space gamma makes no difference. (2) All the color space conversions that I used involved matrix profiles. For a matrix profile, the only valid type of color space conversion is "colorimetric". I used "relative colorimetric" color space conversion exclusively. The color space conversion results varied depending on whether I used black point compensation or not. However, if the color spaces involved all have the same black point, using or not using black point compensation should not make any difference whatsoever. (3) Eric Brasseur's image scaling test produced very odd image discolorations, regardless of what color space (linear or nonlinear gamma) or image depth (8-bit integer or 32-bit floating) was used. (4) Although Gimp 2.9 correctly opens 8-bit tiffs, when opening any 16-bit tiff, the image is subjected to a roughly gamma=2.2 curve. All RGB colors are altered (it's not just a display problem), so the resulting image is too light. Again, my apologies if I'm reporting issues of which you are already aware. Kind regards, Elle Stone _______________________________________________ gimp-developer-list mailing list gimp-developer-list@xxxxxxxxx https://mail.gnome.org/mailman/listinfo/gimp-developer-list
