[digikam] [Bug 446183] New: Star Rating for Picture is not read from File's metadata or read incorrectly

[Tom]

https://bugs.kde.org/show_bug.cgi?id=446183

            Bug ID: 446183
           Summary: Star Rating for Picture is not read from File's
                    metadata or read incorrectly
           Product: digikam
           Version: 7.4.0
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Metadata-ExifTool
          Assignee: digikam-bugs-null at kde.org
          Reporter: tom33st at arcor.de
  Target Milestone: ---

Created attachment 144016
  --> https://bugs.kde.org/attachment.cgi?id=144016&action=edit
Screenshot 1 - Missing star rating in table view

Sample Files (uploaded to dropbox due to large size): 
a) D81_9520.jpg -> No xmp sidecar file, all metadata resides in the .jpg File.
Star Rating NOT read.
https://www.dropbox.com/s/oxsmbbcby6w0zhp/D81_9520.jpg?dl=0

b) D82_1044.jpg -> Also No xmp sidecar file. Star rating shown in DigiKam is
wrong (shows 4, should be 3) / Metadata view shows two different star ratings
https://www.dropbox.com/s/92shc59a9vwpedk/D82_1044.jpg?dl=0


a) Star rating not read from jpg-File D81_9520.jpg
In Thumbnail, Preview and Table-View, DigiKam does not show a Star Rating for
this jpg. 
See attached screenshots sc01, sc02, sc03.png.
In the Metadata/ExifTool Tab is shows in section XMP a Rating (3). For the same
File Apple Aperture / Apple Preview / Excire Photo shows a 3 star rating.
For the correspondig nef File (D81_9520.NEF) which also has the Star-Rating in
the XMP section (NO sidecar file) the star rating is shown correctly.


Running exiftool -g -Rating D81_9520.jpg results in:

---- XMP ----
Rating                          : 3


b) Wrong star rating shown (D82_1044.jpg)
Thumbnail, Preview and Table-View show 4 stars for this one, whereas it only
has a 3 star rating. Metadata/Exiftool shows Rating in the EXIF-Section (4) and
Rating in XMP Secion (3).
See attaches sc10.png
Also here, for the corresponding .nef file the star rating is shown correctly.
Running exiftool on the Shell results in:

exiftool -g -Rating D82_1044.jpg 
---- XMP ----
Rating                          : 3


STEPS TO REPRODUCE
1. Create Album and scan with the linked jpg files
2. check star rating in Tumbnails, Preview or List view
3. Check against exiftools output in shell

OBSERVED RESULT
No or wrong star rating shown.

EXPECTED RESULT
Same star rating as shown in exiftool when run on the shell outside of DigiKam.

SOFTWARE/OS VERSIONS
macOS: BigSur 11.6

ADDITIONAL INFORMATION

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