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Old 10-10-2015, 03:30 PM   #1
Registered: Mar 2010
Distribution: Void Linux
Posts: 39

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adjusting colour in a scan-based pdf to high contrast black & white

I get a lot of badly scanned multi-page pdfs. I want to convert them to high-contrast black & white to make the file size smaller and make them more readable. Thanks!
Old 10-10-2015, 03:32 PM   #2
Registered: Sep 2015
Posts: 733

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Try tesseract.
Old 10-10-2015, 05:05 PM   #3
Registered: Mar 2010
Distribution: Void Linux
Posts: 39

Original Poster
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Ok. what does this mean?

$ tesseract input.pdf output.pdf
Tesseract Open Source OCR Engine v3.04.00 with Leptonica
Error in fopenReadStream: file not found
in pixRead: image file not found: %PDF-1.3
% cannot be read!
Error during processing.


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