This is a copy of Greg Lavino's awesome photo_splitter.py, with some minor adjustments by Daniel Nouri, updated to work with Python 3.10 by me.
Greg published his original code in a ubunutuforums.org thread.
photo_splitter.py is very useful if you need to crop a large amount of images very quickly. Simply select the areas in the image that you want to crop, click "Go" and photo_splitter will create one image file for each crop area for you, in the same folder as the original image.
Here's a screenshot from the StackOverflow question which features photo_splitter.py as the solution:
Before you can run photo_splitter.py, you'll need to install these libraries:
sudo apt-get install python-tk python-imaging python-imaging-tk
An example:
~/photo_splitter/photo_splitter.py ~/images/dog.jpg
Make a for loop to process a bunch of images:
for img in ~/images/*; do ./photo_splitter.py $img; done