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Hi all--sorry to have missed this thread. It's been a busy week. Thank you VladimirS for your help.
A few things:
1. To force no contrast change, actually -cmax -1 is better than -cmax 1, but it hardly matters.
2. If you want an exact replica, also turn off sharpening: -s-
3. Is this being run on Linux? Mac? What version? For the latest versions of k2pdfopt, you can actually just directly enter the command-line arguments into the "Enter option above" prompt. It should work.
4. Are you doing tesseract OCR? You might try different detection options and see if one works better than another. E.g. -ocrd p will entirely use Tesseract's own algorithm for finding text on the page, whereas -ocrd l will have k2pdfopt submit the OCR graphics line by line.
If you want to PM me the PDF source you are trying to convert, I'd be happy to recommend options.
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