https://bugs.kde.org/show_bug.cgi?id=363968
Bug ID: 363968
Summary: Preview thumbnail in .kra/.ora files are sometimes
cropped instead of full canvas
Product: krita
Version: git master
Platform: Other
OS: other
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: File formats
Assignee: krita-bugs-n...@kde.org
Reporter: alvinhoc...@gmail.com
When saving a .kra or .ora file with transparent (alpha = 0) area at the
boundary, the preview.png or Thumbnails/thumbnail.png inside the file is
cropped to the minimum size such that no all-transparent rows and columns are
present at the boundary.
If the image is completely transparent, preview.png or Thumbnails/thumbnail.png
is completely empty with 0 bytes.
On the other hand, the mergedimage.png contains the full image uncropped.
This is causing inconsistent behaviour when external software tries to optimize
thumbnail extraction by using the preview.png or Thumbnails/thumbnail.png for
sizes within 256x256px.
Reproducible: Always
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