Maybe as a starter, Gimp can add a pair of guides at a point using the measure tool. Ctrl-Alt and a click-and-click again adds the guides. The bottom right corner.
To get those to crop, bound to be a better way but...
Add guides at the top left corner
Already have the guides bottom right corner
Make a selection from the guides
Invert selection and fill to remove the discolored border.
Zealous crop to the content.
In the zip two files, for_crop.py Guides-to-selection-mk2.scm the .py goes in your plugins folder / .scm in your scripts folder.
Still hands on, add your bottom-right guides, invoke the plugin Tools -> for_crop Make a keyboard shortcut (I used Z ) a bit quicker.
Example: https://i.imgur.com/oYi4TRG.mp4 about 40 seconds.
What it does not do is (1) Save/Export the image (2) move on to the next image, although Ofnuts has such a plugin. see: earlier post.
One for Ofnuts: Image -> Crop to Selection menu entry but not in pdb ?
To get those to crop, bound to be a better way but...
Add guides at the top left corner
Already have the guides bottom right corner
Make a selection from the guides
Invert selection and fill to remove the discolored border.
Zealous crop to the content.
In the zip two files, for_crop.py Guides-to-selection-mk2.scm the .py goes in your plugins folder / .scm in your scripts folder.
Still hands on, add your bottom-right guides, invoke the plugin Tools -> for_crop Make a keyboard shortcut (I used Z ) a bit quicker.
Example: https://i.imgur.com/oYi4TRG.mp4 about 40 seconds.
What it does not do is (1) Save/Export the image (2) move on to the next image, although Ofnuts has such a plugin. see: earlier post.
One for Ofnuts: Image -> Crop to Selection menu entry but not in pdb ?