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 ...

GIMP is totally open source so there's a community of developers and users contributing to the tutorials. There are beginner-centred guides, including using Layer Masks, Basic Colour Curves and ...

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 ...