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