On 8/5/12, Øyvind Kolås <pippin@xxxxxxxx> wrote: > GIMP-2.9 is only partially on it's way through to be fully working > properly with GEGL/babl. ICC profiles should only need to be involved > upon loading files from disk and exporting to files used outside - > internally it is up to GIMP/GEGL/babl to assign appropriate fully > color managed color spaces to the raster storage of the buffers in the > layers; for 8bpc precision this will be sRGB and for higher bitdepths > this should be linear light/linear scRGB. GEGL through babl knows how > to _accurately_ and efficiently convert between the color spaces and > representations native to babl (without interpolated lookup tables), > this differs from any assumptions that might have been in 2.8 and > before wrt color management and the ability to assign color profiles > to images; I would not trust (and want GIMP to get rid of) any such > things in the UI. > I don't think I understand what the preceeding sentence says. I think it says that ultimately, when all changeover to gegl/babl is complete, Gimp should *not* allow the user the option of assigning one or another ICC color space profile to an image, and *not* allow the user to convert an image from one ICC profile to another. But that can't be right, can it? > PS: I try to make sure that babl and GEGL do what they promise; this > is already more than I have time or energy to deal with; thus I try > stay out of GIMP unless it is changes I have made to GEGL that > directly stops GIMP from building.) My apologies - where Gimp leaves off and gegl/babl take over is not something that I thought about, and I'm still working on figuring out what (and who!) does what. I was hoping (wishful thinking?) that maybe the same 0.45 gamma error that makes tif thumbnails look correct and png thumbnails incorrect (too dark), whereas 16-bit tifs load incorrectly (too light), and pngs load correctly, might also be related to the gegl incorrect blurring of a linear gamma image, as if it had a gamma of 0.45 instead of 1, plus the Gimp 2.8 gamma error of 0.45 reported in this thread: https://mail.gnome.org/archives/gimp-developer-list/2012-July/msg00050.html _______________________________________________ gimp-developer-list mailing list gimp-developer-list@xxxxxxxxx https://mail.gnome.org/mailman/listinfo/gimp-developer-list
