For images that have a smaller or lower quality version at the source.

• Commissioners/artists sometimes post a high res version here, but nowhere else
• The true source is actually on another site, but a link wasn't added
• The post was artificially resized

If the post is artificially resized, the unedited version should be uploaded (if it isn't already) and the resized version should be flagged for deletion or replaced.

See also:

• better_version_at_source
• upscale