[Digikam-devel] [Bug 133913] New: sRGB profile white point may be incorrect

[kde-9]

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           Summary: sRGB profile white point may be incorrect
           Product: digikam
           Version: 0.9.0-beta1
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: kde mpj iki fi


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?
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[F.J.Cruz]

El Lunes, 11 de Septiembre de 2006 16:04, [hidden email] escribió:

> ------- You are receiving this mail because: -------
> You are the assignee for the bug, or are watching the assignee.
>
> http://bugs.kde.org/show_bug.cgi?id=133913
>            Summary: sRGB profile white point may be incorrect
>            Product: digikam
>            Version: 0.9.0-beta1
>           Platform: Gentoo Packages
>         OS/Version: Linux
>             Status: UNCONFIRMED
>           Severity: normal
>           Priority: NOR
>          Component: general
>         AssignedTo: digikam-devel kde org
>         ReportedBy: kde mpj iki fi
>
>
> 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?
> _______________________________________________
> Digikam-devel mailing list
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-devel

Color profiles included in digikam package are provided as you can find them
on the Internet and no developer nor contributor have worked to build these
ones. Specifically you can find sRGB profile at Internet Color Consortium
homepage [http://www.color.org/sRGB.html], just as all its specifications,
history, etc.

Paco Cruz.
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[F.J.Cruz]

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------- Additional Comments From fj.cruz supercable es  2006-09-11 16:25 -------
El Lunes, 11 de Septiembre de 2006 16:04, kde mpj iki fi escribi�:
[bugs.kde.org quoted mail]

Color profiles included in digikam package are provided as you can find them
on the Internet and no developer nor contributor have worked to build these
ones. Specifically you can find sRGB profile at Internet Color Consortium
homepage [http://www.color.org/sRGB.html], just as all its specifications,
history, etc.

Paco Cruz.

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[Gilles Caulier]

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caulier.gilles free fr changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |setup



------- Additional Comments From caulier.gilles free fr  2006-09-11 16:28 -------
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
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[F.J.Cruz]

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fj.cruz supercable es changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID



------- Additional Comments From fj.cruz supercable es  2006-09-11 16:42 -------
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
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[kde-9]

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------- Additional Comments From kde mpj iki fi  2006-09-11 16:55 -------
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.
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["Régis" R.]

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------- Additional Comments From r_rt.bug laposte net  2007-03-11 04:04 -------
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 ?
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["Régis" R.]

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           What    |Removed                     |Added
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                 CC|                            |r_rt.bug laposte net



------- Additional Comments From r_rt.bug laposte net  2007-03-11 05:48 -------
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".
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[Gilles Caulier-4]

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caulier.gilles gmail com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
          Component|setup                       |Color Management
         Resolution|INVALID                     |



------- Additional Comments From caulier.gilles gmail com  2007-03-11 08:59 -------
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
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[Gilles Caulier-4]

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           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED



------- Additional Comments From caulier.gilles gmail com  2007-03-30 12:11 -------
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
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