Rather, a custom font it is created to match the visual appearance of the pixels. Each character on the page is compared and all matching characters are replaced with a an outline character:ĬlearScan does not replace the font with your system fonts. How does ClearScan work?ĬlearScan works by turning the images which represent text characters on the page into smoothed vector outlines. At 600 dpi, the ClearScan file was seven times smaller and looked better. Visual Results and Total File SizeĪt 300 dpi, ClearScan offered improved visual quality at about one-third the total file size. The test machine has an IBM standard 320GB laptop hard drive running at 7200 rpm. The W500 is a current model laptop which runs an Intel Core 2 Duo CPU at 2.8 GHz. In addition to Acrobat, I also had Excel running. The test machine ran Vista Enterprise in 32-bit mode and has 4GB of RAM. I ran OCR and compared file sizes on my ThinkPad W500. 78-page image-only PDF document scanned at 600 dpi.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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