Hello,
1) If you know an image [[image:foo.jpg]] exists, you can do http://domain.com/wiki/Special:Filepath/foo.jpg to download the source file, without having to calculate your own checksum thingy to figure out which directory it's actually stored in. Is there a similar shortcut to image thumbnails? There is thumb.php but that bypasses the cache so it's bad, right?
And on that related note, 2) If you have a central image wiki set-up (as in Wikimedia Commons/other Wikimedia projects), how can you check if the image being referred to is actually on the central project or the local project? Is there a straightforward way to do that? I can think of some roundabout ways but I don't know a straightforward one.
cheers Brianna