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USING ACROBAT 9 PRO
Creating PDFs
• Pages scanned in 24-bit color, 300 dpi, at 8-1/2–by-11 in. (21.59-by-27.94 cm) result in large images (25 MB) before
compression. Your system may require 50 MB of virtual memory or more to scan the image. At 600 dpi, both
scanning and processing typically are about four times slower than at 300 dpi.
• Avoid dithering or halftone scanner settings. These settings can improve the appearance of photographs, but they
make it difficult to recognize text.
• For text printed on colored paper, try increasing the brightness and contrast by about 10%. If your scanner has
color-filtering capability, consider using a filter or lamp that drops out the background color. Or if the text isn't
crisp or drops out, try adjusting scanner contrast and brightness to clarify the scan.
• If your scanner has a manual brightness control, adjust it so that characters are clean and well formed. If characters
are touching, use a higher (brighter) setting. If characters are separated, use a lower (darker) setting.
Recognize text in scanned documents
You can use Acrobat to recognize text in previously scanned documents that have already been converted to PDF.
Optical character recognition (OCR) software enables you to search, correct, and copy the text in a scanned PDF. To
apply OCR to a PDF, the original scanner resolution must have been set at 72 dpi or higher.
Note: Scanning at 300 dpi produces the best text for conversion. At 150 dpi, OCR accuracy is slightly lower.
More Help topics
"Adding unifying page
elements" on page 121
Recognize text in a single document
1
Open the scanned PDF.
Choose Document > OCR Text Recognition > Recognize Text Using OCR.
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In the Recognize Text dialog box, select an option under Pages.
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4
Optionally, click Edit to open the Recognize Text - Settings dialog box, and specify the options as needed.
Recognize text in multiple documents
1
In Acrobat, choose Document > OCR Text Recognition > Recognize Text In Multiple Files Using OCR.
In the Paper Capture Multiple Files dialog box, click Add Files, and choose Add Files, Add Folders, or Add Open
2
Files. Then select the files or folder.
In the Output Options dialog box, specify a target folder for output files, filename preferences, and an output
3
format.
In the Recognize Text - Settings dialog box, specify the options, and then click OK.
4
Recognize text in component PDFs in a PDF Portfolio
Select one or more scanned PDFs in a PDF Portfolio.
1
2
Choose Document > OCR Text Recognition > Recognize Text Using OCR.
Specify the options in the Recognize Text - Settings dialog box.
3
Recognize Text - Settings dialog box
Specifies the language for the OCR engine to use to identify the characters.
Primary OCR Language
Last updated 9/30/2011
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