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Old 08-09-2019, 01:36 AM   #2
asleyam
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Join Date: Mar 2016
Device: kindle voyage, Kobo Forma, Kobo Aura One
Have you tried ScanTailor? It is free and open source. I have a mac so I use ScanTailor via Crossover. Though if you have macports installed then ScanTailor is easy to install. Unfortunately Homebrew does not have a cask for it yet.

http://scantailor.org/

It is designed as a preprocessing tool so it works on batches of scanned images. If you already have a pdf then simply export the pages as images and enter them into ScanTailor. Then use the various settings to crop the headers and page numbers, deskew, set margins etc . It will output in Tif format.

There is no easy one click method that I have found to batch crop out extraneous material from scanned images,
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