[Libreoffice-ux-advise] [Bug 151926] Preview thumbnails should be able to have their size changed, and should be stored as an image file.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=151926

--- Comment #2 from Eike Rathke <erack at redhat.com> ---
The preview image is extracted from an ODF document's Thumbnails/thumbnail.png
if present (or generated as such when saving). That thumbnail is also used by
operating systems to display it in a file manager or similar context.

Citing a Note of the ODF 1.3 standard:
"
Note: Current desktops display preview images within squares of up to 256 pixel
width and height, and 24 bit per pixel. While this specification does not
define upper or lower limits for preview image sizes, producers should only use
image sizes that are displayed with a reasonable quality if scaled to fit into
256x256 pixel square.
"
https://docs.oasis-open.org/office/OpenDocument/v1.3/os/part2-packages/OpenDocument-v1.3-os-part2-packages.html#__RefHeading__752823_826425813

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