Batch processing - detecting various colours to crop to edge of scanned document JPG?

[Ofnuts]

(06-30-2022, 02:50 PM)rich2005 Wrote: One for Ofnuts:   Image -> Crop to Selection  menu entry but not in pdb ?

There has never been a one-to-one mapping between UI functions and the PDB. Some UI functions require two or more PDB calls (gimp_selection_bounds(image) & gimp_image_crop(image, new_width, new_height, offx, offy) for instance) but the opposite can also be true.