Do you have lots of images to edit, but don't want to call ImageMagick?


$ gimp --batch -

This launches GIMP's builtin Lisp environment (TinyScheme), starts a REPL to read code from stdin, allowing powerful batch processing tasks.

Other language bindings are available, but Lisp is native. Documentation is available at Help -> Produce Browser in the main window.

Also useful if you just need Lisp, as most desktops already have one installed. Add --no-interface if you don't need GUI.

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