GIMP has a feature built-in called Python-Fu, and you can automate processes with it. XDA Developers. You can supercharge and automate GIMP with Python, here's how. Story by Adam Conway ...

I think this is the right forum, since it is a gimp question more than a programming question.I simply need to batch convert a large number (1k+) of JPG images (all same size) to grey scale XPM ...

Here are the stories of renaming Python, Perl, and the GIMP. A Renegade Python. Next year marks the end of life for Python 2 — and this time we mean it!