This is my first attempt at a real patch for blender…
This is a patch that will imbed some basic render information with each png or jpg you save with blender (invisibly as an image comment). When you reload that image into blender, you can retrieve and use that render information with either a seq plugin or a py script.
This page has more information plus an upgrade of framestamp and a sample py script that that was used to get the image below:
(sorry, only source code and linux compiles are available at this time )