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Date: Tue, 2 Dec 2008 09:42:45 +0700 (ICT)
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From: Olivier Nicole <on@cs.ait.ac.th>
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Subject: Re: any way to turn a pdf file into something OCR-able?
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> >  1) Some PDFs are just wrappers around JPEG images. In this case
> >  there is no text for pdftotext to convert => epic fail.
> 
> 	In this case "convert" from the ImageMagick port will get you a
> series of .jpg/.gif/.<whatever>.  Read the manual carefully before
> attempting; also note this can be a slow process.

pdfimages (from ports graphics/xpdf) can also do that, maybe at a
lesser cost.

Bests,

Olivier