software recommendation - How can I remove the gray-scale page background of a PDF document scan while preserving the text? (Binarization) - Ask Ubuntu
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scan/fax with text & numbers in black & white - how to improve/cleanup/enhance using Photoshop/GIMP? - Graphic Design Stack Exchange
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I wrote a PDF scan clean up & optimisation tool using Bash, GNU Parallel, ImageMagick convert and Python Tkinter
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3 Methods | How to Sharpen PDF on Windows/Mac/Online - EaseUS
GitHub - ingmarcosp/pdf-sharpen: Enhance images of the PDF's.
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