Bug 133913

Summary: sRGB profile white point may be incorrect
Product: [Applications] digikam Reporter: kde
Component: ColorManagement-ProfilesAssignee: Digikam Developers <digikam-bugs-null>
Status: RESOLVED FIXED    
Severity: normal CC: r_rt.bug
Priority: NOR    
Version: 0.9.0   
Target Milestone: ---   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In: 0.9.2
Sentry Crash Report:

Description kde 2006-09-11 16:04:11 UTC
Version:           0.9.0-beta1 (using KDE KDE 3.5.2)
Installed from:    Gentoo Packages
OS:                Linux

I can't say I really understand colourspace issues, so I'm actually not sure if this is a bug or a feature, but...

The sRGB profile supplied with digiKam uses the white point D50. It seems that D65 is the standard white point for the sRGB space. The implication of this is that if I use the workspace profile supplied with digiKam, I get very warm whites, whereas the use of other (HP/Microsoft) sRGB profiles results in neutral whites.

What is the rationale for using a sRGB profile with a D50 white point?
Comment 1 F.J. Cruz 2006-09-11 16:25:40 UTC
El Lunes, 11 de Septiembre de 2006 16:04, kde@mpj.iki.fi escribi
Comment 2 caulier.gilles 2006-09-11 16:28:37 UTC
Perhaps we can change this sRGB icc file from D50 to D65. The current file come from krita repository.

We just need to have a free for use icc file. Some urls welcome...

Gilles Caulier
Comment 3 F.J. Cruz 2006-09-11 16:42:00 UTC
I'm going to close this bug and marked as INVALID, since really, this is not a bug (see https://bugs.kde.org/bug_status.html about "resolution state"). If anybody has something else to say about it, please feel free to reopen it. 

Gilles, if you think the new state is a wrong one, please change it.

Paco Cruz
Comment 4 kde 2006-09-11 16:55:08 UTC
Adobe has a package of royalty-free ICC profiles that can be bundled with software. It includes AppleRGB, Adobe RGB, ColorMatchRGB and sRGB, as well as a number of CMYK profiles. Please see http://www.adobe.com/support/downloads/iccprofiles/iccprofiles_linux.html for the licence and download. It seems that this is the same sRGB profile used in LittleCms.

LittleCms also has another, apparently more comprehensive profile made by Microsoft and (AFAICT) in the public domain. This could be obtained from the LittleCms tarball.
Comment 5 Régis R. 2007-03-11 04:04:40 UTC
Well, what do you think about Adobe Bundling Agreement ?

The sRGB they provide is called "sRGB IEC61966-2.1".

On this page : http://webstore.iec.ch/webstore/webstore.nsf/artnum/025408
"sRGB IEC61966-2.1" is called "Default RGB colour space - sRGB".

So, I find confusing to have a different sRGB in digikam.
Before seeing this bug, I thought there could be only one sRGB.

Which one is really the internet standard ?
Comment 6 Régis R. 2007-03-11 05:48:47 UTC
I guess the answer to the last question is "sRGB IEC61966-2.1"
because firefox show the image with different colors 
than displayed by showfoto in showfoto's embeded sRGB.

So, perhaps it would be a good thing to remove showfoto's embeded sRGB
or rename it in something like "sRGB - D50".
Comment 7 caulier.gilles 2007-03-11 08:59:25 UTC
Agree to rename this file like D50...

Paco, we can add the other sRGB profile D65 into digiKam, like Krita or Photoshop have. The file is in krita repository.

Gilles
Comment 8 caulier.gilles 2007-03-30 12:11:19 UTC
SVN commit 648037 by cgilles:

digikam from trunk : new icc profile backported from Krita to give SRGB D65 color space 
BUG: 133913


 M  +1 -1      Makefile.am  
 AM            srgb-d65.icm  


--- trunk/extragear/graphics/digikam/data/profiles/Makefile.am #648036:648037
@@ -1,2 +1,2 @@
 digikamprofilesdir = $(kde_datadir)/digikam/profiles
-digikamprofiles_DATA = adobergb.icm applergb.icm srgb.icm widegamut.icm prophoto.icm 
+digikamprofiles_DATA = adobergb.icm applergb.icm srgb.icm srgb-d65.icm widegamut.icm prophoto.icm 
** trunk/extragear/graphics/digikam/data/profiles/srgb-d65.icm #property svn:mime-type
   + application/octet-stream