[Digikam-devel] [Bug 195144] New: Editor shows wrong colors when loading image without color profile and color management is on

[Michal Thoma]

https://bugs.kde.org/show_bug.cgi?id=195144

           Summary: Editor shows wrong colors when loading image without
                    color profile and color management is on
           Product: digikam
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: michal at thoma.cz


Version:            (using KDE 4.2.2)
OS:                Linux
Installed from:    Ubuntu Packages

When opening the image without color profile (more specifically no profile
recognized by Digikam) in editor, the colors are displayed wrongly. This seem
as a result of fact, that Working space profile is somehow applied to these
images. 

This would get mostly unnoticed in case wokring space is set to sRGB (as the
most images without profile are sRGB in fact). Though when some wide gamut
space like ProPhotoRGB is used as working space, then it becomes apparent. Wide
gamut spaces are actually good for postprocessing.

It doesn't make change if I select Convert, Apply or Do Nothing in missing
profile dialog, the image is always displayed wrongly in same fashion -
oversaturated and shifted colors.

It's happening to RAW images too. Here I'm bit confused with Digikam behavior.
If I don't specify input profiles the behavior is same as for the JPEGs and
TIFFs. If I specify input profile, then in case I press Convert the result
colors are still wrong but in different fashion. Apply profile and Do Nothing
still do the same as in case the input profile was not here.

With RAW's (DNGs) I'm even more intrigued when the color management is turned
of. Editor apparently don't apply the DCRaw color matrices to image. This makes
all raw decoding in Digikam virtually useless as just only very few user will
ever be able to produce their own profiles or get valid and compatible input
profiles elsewhere. Color matrices in DCRaw are actually pretty good... So is
profile included in DNGs. But this is maybe different issue.

Hope you can understand.

Regards

M.

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