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computers / comp.text.pdf / Removing background

Removing background

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From: emfril@gmail.com (emf)
Newsgroups: comp.text.pdf
Subject: Removing background
Date: Thu, 15 Sep 2022 08:02:36 -0400
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by: emf - Thu, 15 Sep 2022 12:02 UTC

Re: Removing background

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copy mid

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From: joebeanfish@nospam.duh (Joe Beanfish)
Newsgroups: comp.text.pdf
Subject: Re: Removing background
Date: Thu, 15 Sep 2022 13:53:09 -0000 (UTC)
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by: Joe Beanfish - Thu, 15 Sep 2022 13:53 UTC

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.

Subject	Author
Removing background	emf
Re: Removing background	Joe Beanfish