https://bugs.kde.org/show_bug.cgi?id=426222

            Bug ID: 426222
           Summary: No thumbnails for XCF (GIMP) Images with more than 8
                    Bit precision per channel
           Product: digikam
           Version: 7.0.0
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Albums-IconView
          Assignee: digikam-bugs-n...@kde.org
          Reporter: d...@lachner-net.de
  Target Milestone: ---

Created attachment 131439
  --> https://bugs.kde.org/attachment.cgi?id=131439&action=edit
Test image with 32Bit floating point precision per channel

GIMP 2.10 now can save XCF images with more than 8Bit Precision per channel.
Digikam don't show thumbnail images for this files. I attached a test image to
the bug report to reproduce this behavior. I tested this with digikam 6.4.0
(openSUSE Leap 15.1 package) and 7.0.0 (appimage).

For example this images are created by the following workflow:
Open RAW from digikam in GIMP 2.10 -> Rawtherapee plugin starts -> Finish work
in Rawtherapee -> GIMP opens the image -> Finish work in GIMP and save as XCF

Sure, it is possible to reduce the precision in GIMP but this is not really a
solution. 

I know, I can even send this bug report to the KDE framework or Imagemagick
which are used by digikam to load XCF files. It seems none of them can handle
XCF files with higher precision.

Btw. Is there a way to save a thumbnail as an additional file for the XCF which
is than used by digikam?

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