[Digikam-devel] [digikam] [Bug 353608] New: The preview is blocky, seems to use chroma subsampling

[DrSlony]

https://bugs.kde.org/show_bug.cgi?id=353608

            Bug ID: 353608
           Summary: The preview is blocky, seems to use chroma subsampling
           Product: digikam
           Version: 4.12.0
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Preview
          Assignee: digikam-devel at kde.org
          Reporter: bugs at londonlight.org

The preview is blocky in areas of highly saturated red, the effect looks like
chroma subsampling (though it might be something else entirely, since why would
it get resampled?). Image zoomed to 100%. I thought maybe LCMS was doing
something, but its the same when I turn color management off.
I was previewing this image: http://londonlight.org/i/2015-10-01_k10d_9.jpg
This screenshot shows what happens in digiKam vs Geeqie on the left.
Look closely at the circled area
http://filebin.net/ca6id4n3of/scrot_2015-10-06_163914.png
Same strange thing when I open it in the image editor.

Fine in RawTherapee, Gwenview, Geeqie and GIMP.

Reproducible: Always

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