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I have a pdf file (500 pages) with a lot of images ( black and white). However, the text is blurred and although it is readable, it's really a pain ( maybe hardcopy was scanned poorly, not sure on that).

Is there some way I can 'clean' the pdf file ? I can manage with diagrams in the present quality because they are big and so I'm ok. But the text is not manageable. So ideally, I would like to create a replica but with good text quality.

I can't really use some convertors because there are images in the pdf file (and that too plenty in no).

Using ubuntu 14.04.

I'm not a dev. Just a normal user.

Update:

I would again like to emphasise that pdf file has a lot of images as well, and text is blurred badly. Unfortunately, gscan2pdf didn't work at all.

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You should try using gscan2pdf, One of my mates was using it recently and said it was good and made the font readable.

Here's a link for the same : https://apps.ubuntu.com/cat/applications/precise/gscan2pdf/

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  • Nope. That didnt work. I Tried 'clean' option with the pdf as well as OCR. Both didnt work.
    – Plutonium smuggler
    May 1, 2015 at 17:29
  • @ParanoidPanda: That's irrelevant, because the link doesn't try to provide instructions but a piece of software.
    – David Foerster
    May 2, 2015 at 21:22
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    @Siddarth: Please explain, how to use gscan2pdf to “clean” scanned images (see How do I write a good answer?).
    – David Foerster
    May 2, 2015 at 21:22

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