On Thu, 15 Sep 2022 08:02:36 -0400, emf wrote:
Some pdf scanned books have a brownish background. How can I
remove the background of these pdf file?
That's probably the color of the paper. A scan is, after all, basically
a picture of the page. You might be able to import it into an image
editor and adjust the colors/contrast/threshold.
If the book is also OCRed, you could use pdftotext or pdftohtml to
extract the text and read it that way.
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