On 01/24/2010 07:26 AM, Omari Stephens wrote: > On 01/23/2010 08:04 AM, Martin Nordholts wrote: >> Hi >> >> Right now we don't have a clearly defined color management strategy for >> GIMP. >> >> I would like us to settle a minimal color management strategy for GIMP >> so that we can fix some inconsistencies in our color management, in >> particular for PNG [1], for 2.8. In short the problem with PNG is that >> the current code always writes an sRGB chunk to a PNG file if no color >> profile is attached to the image and no gamma is specified. >> >> I suggest that we formally settle with this minimal color management >> strategy: >> >> >> """ >> An image either has or has not a color profile attached. A color >> profile is attached as a GimpParasite named "icc-profile". >> >> For images that have a color profile attached, this color profile is >> used when displaying the image and is embedded when the image is saved >> or exported. >> >> For images that does not have a color profile attached, the global >> color profile defined under Color Management in Preferences is used to >> display the image, but no profile is embedded into saved or exported >> files. >> """ >> >> >> So, does the above sound like a sound foundation for color management in >> GIMP? I don't expect us to have time to apply this strategy consistently >> all over GIMP for 2.8 but at least we have settled on something that we >> can put in devel-docs and continue to build on later, and it allows us >> to fix the PNG problem for 2.8. > > Sounds eminently reasonable; I had run into this issue also. FWIW, http://hsivonen.iki.fi/png-gamma/ seems like a pretty good article on this topic; curious folks should give it a read. It also suggests that the current GIMP behavior is Bad. > I had naively signed up for the "work on color management" job. That > said, do you happen to know where the sRGB thingie is added by default? > (if not, I can probably find it, but if you know offhand, I'm not > beyond laziness ;o) It was actually trivial to find. Right now, I'm just considering the consequences before I nuke that 4 lines of code. > I had also been taking a peek at [2] and [3], which also seem to fall > under the umbrella of this desired behavior. Finally, [4] is something > that bites me a lot, but needs some UI/UX work. guiguru? These will probably be more than 4 lines of code ;o) > > [2] https://bugzilla.gnome.org/show_bug.cgi?id=556608 "Monitor color > profile is not applied to filter preview" > [3] https://bugzilla.gnome.org/show_bug.cgi?id=478528 "Layer previews > are not color managed" > [4] https://bugzilla.gnome.org/show_bug.cgi?id=320447 "fast switching > between 'color managed display' and 'softproof'" --xsdg _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
