Gallery's Free Software licence and its powerful module system have led to the development of plugins implementing just about every feature imaginable. One popular module, called simply "tags," gives users the ability to associate any number of text tags with an image, and then search through their photo albums by tag. This is a powerful and intuitive way to organize large groups of photos.

Two top photo sharing applications on the web, Flickr and Facebook, have similar functionality, but they have each taken this feature a step further. Both services allow users to associate a tag with a specific area of an image. Facebook uses this idea so that users can tag pictures of friends, and Flickr provides the ability to attach "notes" to user-specified regions of an image.

This project will implement for Gallery the best aspects of image region based tagging found on both Facebook and Flickr, along with features and improvements that will be exclusive to Gallery.
    
The core feature set will allow a user to associate any region of an image with a tag, a text note, or another user. This will include the combination of a solid backend and an intuitive user interface that will allow adding and editing tags and searching based on these tags.

Once this is in place, additional features to be investigated and implemented include: a suggestion & approval system so users without accounts can tag, integration of person tagging with social networking sites, blocks to display latest tagging activity, and other related features.