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Scanned pages into pdf

Posted on 2006-06-27
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Last Modified: 2010-04-17
hello all does anyone  know how are scanned pages containing text converted into pdf and what is the format in which text is stored in the pdf. Can this text be directly extracted from the pdf or some technique like OCR is required to be used.

Thanks
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Question by:jhav1594
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jm021196 earned 2000 total points
ID: 16994505
It reallly depends on what app you are using and the quality of the page.

If the PDF Converting program which is being used to take the image from the scanner can recognise the text as text then its stored as text in the PDF File.

If the converting program cannot recognise it as text then it gets saved in a variety of image formats depending on which one suits it best. There really is no way to tell how its saved in advance.

PDF Files use a combination of vector, raster and text formates to give the best compression and viewability and so converting to PDF is a very difficult thing to undo... especiall if its not possible to tell in advance if its going to be in text or not.

I would suggest that a OCR system is the best way forward.

Thanks
mitch
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