Magnus Manske wrote:
Well, it could generate said categories as e.g. (on human.svg) [[Category:Knee|Human.svg (box:10,10,20,20)]] JavaScript could check for these for each image on the page. Might be JS overkill, though.
I took me a while to understand what you mean with this. I was thinking in including into an article (maybe with a tagged parameter), not into the automatic preview on categories. Interesting thought, though quite open for category abusing.