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Re:Tesseract OCR by david_allison on Sunday July 18, 2021 @10:17PM (#27878588)
You typically need to pre-process the images.

I'd recommend https://scantailor.org/ for this (OSS, but unmaintained)

Re:Tesseract OCR by buovjaga on Monday July 19, 2021 @01:38AM (#27879597)
This has the latest developments, but is also seemingly unmaintained for over a year: https://github.com/4lex4/scantailor-advanced

Scan Tailor forum: https://forum.diybookscanner.org/viewforum.php?f=21

Re:Tesseract OCR by app4soft on Monday July 19, 2021 @06:42PM (#27888125)
> [ScanTailor Advanced] seemingly unmaintained for over a year

ScanTailor official repo also archived on November 29, 2020.[0]

> This project is no longer maintained, and has not been maintained for a while.

As alternative to ScanTailor (and its forks) there is gImageReader (Tesseract Qt/GTK GUI), but also seems like unmaintained since 2019.[1,2]

[0] https://github.com/scantailor/scantailor/commit/e881b30b6ed1...

[1] https://github.com/manisandro/gImageReader

[2] https://github.com/probonopd/gImageReader/releases/tag/conti...