Packing in for the night, but you might get a result with a couple of scripts. Zipped, attached, unzip and put in C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\scripts
1. sg-save-all-layers.scm Find it bottom of the file menu, does what it says.
Open the PDF set the resolution to 300 ppi Load all the pages and apply the script to export to individual pages. Obviously use a 'project folder' for this. Exports as png images.
2. DivideScannedImages.scm Find in Filters -> Batch Tools Point it at the project folder, etc,etc set it going and hope. I would check it with a couple of pages first in case the default settings need adjustment.
You might get a better answer if you post a single page as an example. There are other tools, ImageMagick command line application for batch operations for example.
1. sg-save-all-layers.scm Find it bottom of the file menu, does what it says.
Open the PDF set the resolution to 300 ppi Load all the pages and apply the script to export to individual pages. Obviously use a 'project folder' for this. Exports as png images.
2. DivideScannedImages.scm Find in Filters -> Batch Tools Point it at the project folder, etc,etc set it going and hope. I would check it with a couple of pages first in case the default settings need adjustment.
You might get a better answer if you post a single page as an example. There are other tools, ImageMagick command line application for batch operations for example.