GNOME Bugzilla – Bug 727038
GIMP doesn't use color profiles with thumbnails
Last modified: 2014-04-11 15:59:40 UTC
Hi. I've attached three low res scans from some film material, made with SilverFast... each of them was created with different color profiles. sRGB ECI RGB v2 ICC4 ROMM RGB (also ICC v4) When I display these files with e.g. imagemagick or Eye of GNOME, then all three look basically like the same (i.e. same colours). But when I open it in GIMP, then the colors look all different, just as when I open them with some dumb default Windows viewer (as said, made with SilverFast) which has no clue about color management. This happens regardless of whether I tell GIMP to "Kepp" or "Convert" the color space when the image is opened. Any ideas? Cheers, Chris.
Created attachment 272891 [details] ECI v2 ICC v4
Created attachment 272892 [details] ROMM RGB (ICC v4)
Created attachment 272893 [details] sRGB (i think ICC v2)
Oh... btw: Whenever I open an image which has an ICC v4 profile embedded... then gimp names the profile "(invalid UTF-8 string)"... probably some other bug.
FYI: In e.g. digikam, the behaviour seems to be the same as in GIMP: https://bugs.kde.org/show_bug.cgi?id=332598
Yeah... well... maybe I have to take everything back O:-) Uhm I found out in the meantime, that imagemagick's display seem to not support color profiles at all (except, showing their names)... and eog seems to only support them for JPEG, but not for TIFF. This eventually tricked me to believe that digikam/gimp were wrong, but maybe/I guess they're not. Now I've created a new set of scan's with silverfast: http://christoph.anton.mitterer.name/tmp/public/1e7337c4-b9a1-11e3-9385-502690aa641f/c/ The readme tells which file is scanned with which parameters... Something strange happens now: The files that I've scanned with the Epson scanner profile,... => look all the same in programs that DO (I guess) support color profiles (like GIMP) => look way different in programs that DON'T support color profiles The files that I've scanned with NO scanner profile,... => look all the same in programs that DON'T (I guess) support color profiles => look way different in programs that DO support color profiles Okay I don't understand that behaviour... but at least it seems GIMP is right. Also, looking at these test images: http://www.color.org/version4html.xalter seems to show, that color support in GIMP is working (and I've converted them to TIFF as well, and there it works too). Please confirm that behaviour!
In spite of the last comment, there is one real bug left in GIMP with respect to color management (and this time not only TIFF is affected). It seems that GIMP doesn't apply color profiles when he creates any thumbnails (changing the bug title accordingly). I'll attached an example image in a few seconds, where you can see the test images from the ICC opened (as JPEG and TIFF) and where the main image view is correct, but the thumbnails in the tabs are broken.
Created attachment 273422 [details] GIMP with no color managed thumbs
Yes this is indeed missing, thanks for investigating the issue. *** This bug has been marked as a duplicate of bug 478528 ***