https://bugs.kde.org/show_bug.cgi?id=473826

            Bug ID: 473826
           Summary: digikam with exiftool backend erases XMP tags
    Classification: Applications
           Product: digikam
           Version: 8.1.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Metadata-ExifTool
          Assignee: digikam-bugs-n...@kde.org
          Reporter: karlic...@gmail.com
  Target Milestone: ---

Created attachment 161232
  --> https://bugs.kde.org/attachment.cgi?id=161232&action=edit
diff of exif data before/after digikam

I tried using digikam with exiftool backend (exiftool version 12.40) -- tried
setting some photo tags, and found out that most XMP original metadata from my
photos is erased.

I dumped the metadata before and after applying changes in digikam (with
"exiftool -G") and compared the results (attached the diff as a screeenshot).

In particular it loses XMP tags like "MotionPhoto": 1, which makes me worried
that they won't be detected as motion photos after processing with digikam.

I tried setting the tag with command like exiftool instead -- and the same is
happening. I guess this is due to XMP Toolkit of exiftool not knowing anything
about the original tags the phone camera sets (original xmp toolkit is Adobe
XMP Core 5.1.0-jc003). So I imagine it's more of an exiftool issue (here's a
similar issue someone having with exiftool
https://exiftool.org/forum/index.php?topic=11901.0 ).

But I guess could be useful if digikam was a bit more explicit about removing
tags unrelated to the ones I was originally changing.

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