Quote:
Originally Posted by Mike_73
Actually, some pdfs allow highlighting stuff even though it's a scan. Acrobat pro has some OCR features where you can select whether you want the pdf completely rebuilt or only have some "invisible" text behind the scan so you can highlight and search the text within the scans.
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Yes, that's true, for example, of any book that you download from Google books. Although it's a page scan, it also has OCR'd text in it, which can be searched for, highlighted, copied, etc. On occasions the OCR is, however, rather poor.