[Gimp-developer] Minimal color management strategy for GIMP 2.8
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. / Martin [1] PNG output: omit unwanted chunks (sRGB) https://bugzilla.gnome.org/show_bug.cgi?id=599065 -- My GIMP Blog: http://www.chromecode.com/ Best way to keep up with GIMP from git ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
[Gimp-developer] Wiki down.
Having discussed here the possibility of helping out with wiki admin, I've spent the last week or two attempting to set up an account. Attempting because wiki.gimp.org is not responding. I did query this in my original email on the subject, attempts to ping it return: From soda-10g-edge.EECS.Berkeley.EDU (169.229.59.242) icmp_seq=2 Destination Host Unreachable I can't find any references in Bugzilla, but this has been down now for around 2 weeks (at least). On the off-chance that it's just an issue at my end, can anyone else connect to it, or is the wiki truely dead? If it's the latter, then do we have a way of resurrecting it? :-) -- Jon Senior j...@restlesslemon.co.uk ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
Re: [Gimp-developer] Wiki down.
On 23.01.2010 10:46, Jon Senior wrote: Having discussed here the possibility of helping out with wiki admin, I've spent the last week or two attempting to set up an account. Attempting because wiki.gimp.org is not responding. I did query this in my original email on the subject, attempts to ping it return: From soda-10g-edge.EECS.Berkeley.EDU (169.229.59.242) icmp_seq=2 Destination Host Unreachable I can't find any references in Bugzilla https://bugzilla.gnome.org/show_bug.cgi?id=600757 HTH, Michael -- GIMP http://www.gimp.org | IRC: irc://irc.gimp.org/gimp Wiki http://wiki.gimp.org | .de: http://gimpforum.de Plug-ins http://registry.gimp.org | ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
Re: [Gimp-developer] Wiki down.
On Sat, 23 Jan 2010 13:24:54 +0100 Michael Schumacher schum...@gmx.de wrote: On 23.01.2010 10:46, Jon Senior wrote: Having discussed here the possibility of helping out with wiki admin, I've spent the last week or two attempting to set up an account. Attempting because wiki.gimp.org is not responding. I did query this in my original email on the subject, attempts to ping it return: From soda-10g-edge.EECS.Berkeley.EDU (169.229.59.242) icmp_seq=2 Destination Host Unreachable I can't find any references in Bugzilla https://bugzilla.gnome.org/show_bug.cgi?id=600757 OK. That's getting on a bit now. Is there an ETA for the switch back? -- Jon Senior j...@restlesslemon.co.uk ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
Re: [Gimp-developer] Minimal color management strategy for GIMP 2.8
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. 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) 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? [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@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
