One thing that has always annoyed me about most wiki is the way they handle images. MediaWiki, like most wikis, allows users to upload images and embed pictures. However, if you want to change an image, you need to download the file, open it up in GIMP, Inkscape, or Photoshop, edit it, save it, and re-upload it. Somewhere in this long process, the ease of editing that makes wikis so wonderful gets lost. Basically, I’m annoyed because images in wikis aren’t very "wiki."
It is in the form of an extension to Mediawiki I’ve called EditImage. It’s an afternoon hack from an under-qualified PHP hacker so it’s nothing special. You can read it about on its page in the Mediawiki wiki and you can try it out on my personal wiki where I have it installed.
I’m certainly not the first person to think about doing this. In fact, some old pages in the MediaWiki wiki imply that I’m not even the first person to play around with the idea of using Spurr’s code to do image cropping for MediaWiki. Hopefully though, my code can act as a nice first step and a framework for folks wanting to add additional image manipulation features. For example, I think it would be quick to add the ability to do in-browser brightness and contrast manipulation and I would love to see this in a future version of the extension.