Board Thread:Support Requests - Getting Started/@comment-24319470-20140423151832/@comment-168424-20140424001556

Since PNGs support transparency and JPGs don't (as far as I know), you would need a way to specify transparency going from JPG &rarr; PNG. It could possibly be done with an extension, but nothing like this exists in the base MediaWiki engine and Wikia has yet to make any extensions to manipulate graphics in the wiki (again, as far as I know).