Here it is... for installation instructions see here, in the "Installation" section at the bottom.
The filter can be found as Filters>Enhance>Crop and enhance but is best assigned to a keystroke with Edit>Keyboard shortcuts (find it by entering "gimpy222" in the search bar).
Three remarks:
The filter can be found as Filters>Enhance>Crop and enhance but is best assigned to a keystroke with Edit>Keyboard shortcuts (find it by entering "gimpy222" in the search bar).
Three remarks:
- If you look at the script code, you'll notice it just does an (adequately computed) crop. The result is identical to the one obtained with your workflow, which in the end is just a way to have a 2000*3300 crop of the image with the initial selection centered in it.
- On the page with the installation instructions you will find ofn-file-next. This script can be a great time saver when mass-processing images, since it does "export image, close image, open next image in sequence" in one single operation (and is best assigned to a keystroke), which is where one usually spends the more time when doing simple processing on many files.
- Your images look professionally scanned/photographed so the cropping should be rather constant (or subject to a regular drift that can be easily compensated) among left-hand and right-hand pages. This would allow a completely automated batch-cropping.