https://bugs.kde.org/show_bug.cgi?id=490859
Bug ID: 490859
Summary: Image color profile is not taken into account when
creating thumbnails for 16 bit tiffs
Classification: Applications
Product: digikam
Version: 8.4.0
Platform: Other
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: Thumbs-Engine
Assignee: digikam-bugs-n...@kde.org
Reporter: harri...@gmail.com
Target Milestone: ---
Created attachment 172012
--> https://bugs.kde.org/attachment.cgi?id=172012&action=edit
Sample images and screenshots
SUMMARY
The thumbnails for those 16 bit tiff files that have an embedded color profile
other than sRGB have incorrect colors. This does not seem to depend on which
color profile is used or which application created the image. The image itself
opens correctly in preview and in the editor. Only the thumbnail colors are
incorrect.
Same results on both windows 10 and on Linux using appimages.
Digikam 8.2 works fine, but both 8.3 and 8.4 have this bug.
STEPS TO REPRODUCE
1. Create a 16 bit color tiff image using a color profile other than sRGB.
Using a profile with a large gamut will make the result obvious. The attachment
contains sample files.
2. Load the image into digikam
OBSERVED RESULT
Thumbnail colors are not correct.
EXPECTED RESULT
Thumbnail colors should agree with digikam 8.2 thumbnail colors, and how the
image is displayed in preview.
SOFTWARE/OS VERSIONS
Windows: 10
Qt Version: 6
Also Ubuntu with appimages, e.g., with digiKam-8.4.0-Qt6-x86-64.appimage
ADDITIONAL INFORMATION
>From the attachment look at the screenshot "Thumbnails with
digiKam-8.4.0-Qt6-x86-64.appimage". All three thumbnails should look identical,
but one of them has desaturated colors. The offending image opens correctly in
preview, see "Preview image with digiKam-8.4.0-Qt6-x86-64.appimage"
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