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Not sure how it will handle angles, but scantailor is by far the best for cropping and cleaning up scans: https://github.com/yb85/scantailor-advanced-osx
Use imagemagick to convert them to PDF and ocrmypdf to straighten and OCR. See this explanation.
Use imagemagick to convert them to PDF and ocrmypdf to straighten and OCR. See this explanation.
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