Here is a short script (1.6kb) to add a timestamp on all PNG pictures in a directory. It requires Python and the Python Image Library ( PIL). In order to use it, modify some parameters in the beginning to suit your needs (images directory, font file and size, etc.) and launch ./timestampFiles.py. Here is a before/after example (size of pictures is reduced to fit in this blog): ...
In the Free Software Movement, we believe computer users should have the freedom to change and redistribute the software that they use. The “free” in free software refers to freedom: it means users have the freedom to run, modify and redistribute the software. Free software contributes to human knowledge, while non-free software does not. Universities should therefore encourage free software for the sake of advancing human knowledge, just as they should encourage scientists and other scholars to publish their work. ...