78-page image-only PDF document scanned at 300 dpi.Read on to learn about size comparisons, how to use ClearScan OCR and a bit more about how it all works. I've recently completed some benchmarking which shows dramatic file size decreases and quality gains. ClearScan offers improved text quality with a decrease in file size: In Acrobat 9, Adobe engineers added a new flavor of OCR called ClearScan. 300 dpi) increases file size about three to four times.īecause of the image-heavy content, searchable image PDFs can take a long time to print.Īt 300 dpi, scanned documents are easily distinguishable in quality from computer-generated files. Scanning at higher resolutions (600 dpi Vs. Searchable Image OCR has some shortcomings:įor 300 dpi black and white scans, a typical file size is 15-40K per page. Searchable Image retains the underlying scanned image and adds an invisible layer of text on top, which may be selected: While OCR accuracy and language support have improved over the years, the default OCR "flavor"- Searchable Image- was the only useful choice. This technology has been available in Acrobat for about ten years. Optical Character Recognition (OCR) converts scanned paper documents into searchable PDF documents.
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