Other funny sizes probably come from the thumbnails shown on the file
page itself. For example, for this random file:
https://commons.wikimedia.org/wiki/File:Bruxelles_à_travers_les_âges_(1884)_(14740799976).jpg
The main big thumbnail is 796×600 pixels, and the small thumbnail under
"File history" is 120×90.
Additionally, for every thumbnail, thumbnails with 1.5× and 2× sizes are
generated to be used on devices with high-resolution screens.
And additionally, you can set an arbitrary size for any thumbnail used
in an article, and MediaWiki will dutifully generate a thumbnail of that
size.
As far as I know there is currently no option to disallow generation of
thumbnails of arbitrary sizes, and limit it to some preset list.
--
Bartosz Dziewoński
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