Highlighting text in Adobe Acrobat 6

I have scanned in a considerable number of pages into an adobe pdf file. I cannot seem to highlight any text. The highlight tool is picked up ok but does not mark the text. Thank you for any assistance.
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If it's scanned, maybe it's not converted to text - as far as I know you can only highlight "real" text, noch bitmaps (scanned documents).
C_GilmoreAuthor Commented:
Aaah - yes that sounds likely - I have no need to convert it to text - it is a very bulky document and would probably take ages - do you know if there is any third party software which could do so ?

To convert to text or to highlight? For converting to text (OCR) I use Abbey Fine Reader, OmniPage Pro and Iris (something or other :)).
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C_GilmoreAuthor Commented:
Sorry I meant to highlight the text
Karl Heinz KremerCommented:
You can use Acrobat's "Paper Capture" function to OCR your documents. You don't have to actually use the OCRed text for display purposes, Acrobat gives you different options to OCR. If you are not interested in the OCRed text for display, use the "Searchable Image" function. This will leave the scanned image in the foreground, and will put the OCRed text behind the image. However, Acrobat "knows" where the text portions are, so the highlight tool will work.

In Acrobat, select "Documents>Paper Capture>Start Capture", then click on the "Edit" button to change the settings. Once you've processed the complete document, the highlight tool will work.
C_GilmoreAuthor Commented:
Thank you for your advice. I followed this just now but get an error message "This page contains renderable text". I have tired this on a number of files but get the same message. These include files "fixed" with PDF Enhancer which you kindly recommended in response to an earlier difficulty I had ( and which worked a treat !). Any ideas ?
Karl Heinz KremerCommented:
Acrobat is stupid when it comes to OCR: It expects that the page does not contain anything but your scanned image. As soon as it finds anything else, it refuses to process the page. In this case, your choices are to go back to the original scan, or to use a 3rd party scan solution like e.g. Abbyy's FineReader (http://www.abbyy.com/finereader_ocr/) (which in my opinion is better than ScanSoft's OmniPage - http://www.abbyy.com/finereader_ocr/). Both of these packages can work with PDF files and have the same options that Acrobat offers, but can work with documents that contain renderable text.

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C_GilmoreAuthor Commented:
I already have Abby's FineReader. Sorry to be stupid but can you talk me through the process I should use. I have only used it before to convert scanned images to MS Word which it does excellent job of.
C_GilmoreAuthor Commented:
I think I have just managed to work it out for myself and it works ok. Thanks for your help in solving this mystery! Is it only me or is the Adobe documentation a little sparse on this issue.

Thanks again CDG
Karl Heinz KremerCommented:
I can assure you, it's not just you ...
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