Nope, uploads are not versioned. *Articles* in the Image: namespace
*are* versioned. In other words, the text you write on an Image: page
is versioned, but not the uploaded file.
Images sit in the /wiki/images folder. When you upload a new version,
the old file is overwritten.
DanB
-----Original Message-----
Does MediaWiki do that itself? There are file histories on all the
[[Image:X]] pages, aren't those what you want?