Last modified: 2013-07-24 19:07:52 UTC
The output of MediaWiki's info action should include the number of local uses of a specified file (page in the File namespace).
Counting is nasty, databasewise.
Actually, I don't think this is possible without introducing a table or column where we can keep track of the number of uses. -easy
For bug 41365 a count for template transclusion was added, maybe this can be done in the same way.