[krita] [Bug 504060] New: Add export option to limit thumbnail.png size in .ora files

[Thomas Berger]

https://bugs.kde.org/show_bug.cgi?id=504060

            Bug ID: 504060
           Summary: Add export option to limit thumbnail.png size in .ora
                    files
    Classification: Applications
           Product: krita
           Version: 5.2.9
          Platform: Microsoft Windows
                OS: All
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: File formats
          Assignee: krita-bugs-n...@kde.org
          Reporter: thomas.berger....@freenet.de
  Target Milestone: ---

Currently, Krita saves a full-size thumbnail.png inside the /Thumbnails/ folder
of every .ora file. In many cases, this thumbnail is as large as the canvas
itself (e.g. 2204×1240), which unnecessarily increases the file size—sometimes
by several megabytes.

This is problematic when managing large numbers of .ora files, sharing them
online, or working with limited storage. A smaller thumbnail would still
provide a good file preview in operating systems like Windows or KDE without
bloating the file.

Feature request:
- Add an option to limit the resolution (width/height) of thumbnail.png when
exporting .ora files
- For example: max width 256px (automatically scaled down from canvas)
- Optional: allow setting this limit in the export dialog or application
settings

This would help keep .ora files compact and improve usability for artists and
developers alike.

Kind regards,  
Thomas

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