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I use https://kebekus.gitlab.io/scantools for scanning, it builds on top of tesseract and works great for pdf enhancements


You might be interested in https://github.com/ocrmypdf/OCRmyPDF then.

It does quite some preprocessing on the PDF pages before passing it on to tesseract.


I've found ocrmypdf to be excellent: the only issue I've had is with PDFs with differing page sizes; it seems to scale everything up to the size of the largest page, which can be a bit of a pain.




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