[Digikam-devel] [digikam] [Bug 339961] New: Hierarchical tags lost when sharing images from Digikam to Windows Photo Gallery / Windows Explorer

[Antoine Chauveau]

https://bugs.kde.org/show_bug.cgi?id=339961

            Bug ID: 339961
           Summary: Hierarchical tags lost when sharing images from
                    Digikam to Windows Photo Gallery / Windows Explorer
           Product: digikam
           Version: 4.4.0
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Metadata
          Assignee: digikam-devel at kde.org
          Reporter: antoine.chauveau at gmail.com

There is an issue where Windows Photo Gallery / Windows Explorer can't read
hierarchical tags written by Digikam. Interoperability in the other direction
works fine.

Reproducible: Always

Steps to Reproduce:
1. Create a file with hierarchical tags in Windows Photo Gallery
2. Import into Digikam. This works just fine.
3. Execute "Write Metadata to Images" in Digikam.

Actual Results:  
Open the file from Step 3. in Windows Photo Gallery. The tag hierarchy is lost,
only leaf tags remain.
Look in Windows Explorer. The same information loss is visible in tooltips and
details view.

Expected Results:  
Hierarchical tags are still visible in Photo Gallery and Explorer.

Digikam stores only leaf nodes under XMP-dc "Subject", the field that Photo
Gallery and Explorer read in priority. The complete hierarchy is stored in
other fields but that doesn't help these apps.

Digikam also writes leaves-only data to a new field IPTC "Keywords", but I
assume that Photo Gallery doesn't care since XMP data is present too.

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