https://bugzilla.wikimedia.org/show_bug.cgi?id=56546

       Web browser: ---
            Bug ID: 56546
           Summary: Specify file format of preview if different from
                    original file
           Product: MediaWiki
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: File management
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected], [email protected]
    Classification: Unclassified
   Mobile Platform: ---

Several file formats (notably PDF, DjVu, SVG, and TIFF) show in-browser
previews, using the links under the image on its description page, in different
file formats (JPG and PNG) than the original file, but the interface does not
warn the user of this anywhere. All it says is:

"Size of this preview: 463 × 599 pixels. Other resolutions: [...]"

For these file types, the message should specify, e.g., "These preview images
will be rendered in JPG", much as several projects are already doing through
site-specific JS (see SVGs on Commons:
https://commons.wikimedia.org/wiki/File:Svg_example4.svg "This image rendered
as PNG in other widths: 200px, 500px, 1000px, 2000px."). This is also important
usability-wise because the preview file formats are typically more
user-friendly than the original files. We should be making users aware that
when they are looking at a large file in unfamiliar TIFF format that they are
able to simply download JPGs from the preview links.

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