I'm working on a simple blog + image gallery website. As the purpose of the image gallery is to display artwork, I'd like to attach a variety of metadata to each image -- e.g. year and type of materials used. That's easy enough to do in itself, but I also want the user to be able to insert those images into his blogposts. I'm not really looking forward to writing an entire blog application for this sole purpose, however; is there a blog app out there with image management features that can be customized to suit my purposes?
Languages of choice: php + python.
edit: thus far I've tried wordpress. from a brief look at the code their image metadata fields seem to be hardcoded, so I don't think I could write a plugin to add more in.