OCR works without issue on some files, not others?

Acrobat 10.1.1
While working with converting presentation slides to OCR and exporting them I am only able to get some PDFs to properly OCR. I am using the same process though it seems it simply won't take on some while it does others.
Tools > Recognize Text > In this file > (Default settings) Ok
and yet I get different outcomes.
Is it possible that background colors/type color/font etc. are conflicting with the OCR process? Again keep in mind these are presentation slides that have been converted into PDFs that I am attempting to OCR for export into Word.
Thanks.

Most of the time you would not be able to OCR such documents because they are not pure graphics. OCR in Acrobat can only be done on pure graphics. If there is else on the page, OCR will not work. A work around is to save the document as a TIFF and then import all the TIFF files produced into a new PDF and run OCR on that. Be careful to use a high enough resolution, the other aspect than can cause OCR to fail (there is a minimum resolution -- 200 or 300 dpi).

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