Add Notes Over Images With Fotonotes

Fotonotes is a collection of scripts for annotating images. Simply, it lets you add notes over images.

JavaScript Text On Images

With the help of a PHP file (supports PHP4 & PHP5), every note added to the images are stored in JPEG headers in XML format.

There is a very nice example on the website which you can try the code.

Download package includes classes for alternate storage strategies like databases.