I have to select one setting for all docs, and I'm inclined not to alter our documents in any way at the expense of OCR. Does that make any sense? I switched directly from 8 to X so I'm not familiar with Acrobat 9. Text-based PDF files are searchable because they contain real text. PDF files can also originate from a scan or a fax.
These are image-based PDF files, meaning that they are simply a picture of the original. To your computer, these images are no different than digital photos or graphics.
Your computer does not see any text in them. To make these files searchable, it is necessary to "recognize" the text in the image using optical character recognition "OCR".
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