Scan a paper document to PDF

You can create a PDF file directly from a paper document, starting within Acrobat and using your scanner. In Windows XP, Acrobat supports TWAIN scanner drivers and Windows Image Acquisition (WIA) drivers.

Scanning tips

• Acrobat scanning accepts images between 10 and 3000 ppi. If you select Searchable Image or Full Text & Graphics for PDF Output Style, input resolution of 72 ppi or higher is required, and input resolution higher than 600 ppi is downsampled to 600 ppi or lower.

• On the Color/Grayscale menu in the Optimization Options dialog box, apply lossless compression to a scanned image by choosing CCITT for black-and-white images or Lossless for color or grayscale images. If this image is appended to a PDF document, and the file is saved by Save, the scanned image remains uncompressed. If the PDF document is saved using Save As, the scanned image may be compressed.

• For most pages, black-and-white scanning at 300 ppi produces text best suited for conversion. At 150 ppi, OCR accuracy is slightly lower, and more font-recognition errors occur; at 400 ppi and higher resolution, processing slows and compressed pages are bigger. If a page has many unrecognized words or very small text (9 points or smaller), try scanning at higher resolution. Scan in black and white whenever possible.

• When Recognize Text Using OCR is disabled, full 10-to-3000 ppi resolution range may be used, but the recommended resolution is 72 and higher ppi. For Adaptive compression, 300 ppi is recommended for grayscale or RGB input, or 600 ppi for black-and-white input.

• Pages scanned in 24-bit color, 300 ppi, at 8-1/2–by-11 inches (21.59-by-27.94 cm) result in large images (25 MB) prior to compression. Your system may require 50 MB of virtual memory or more to scan the image. At 600 ppi, both scanning and processing typically are about four times slower than at 300 ppi.

• Avoid dithering or halftone scanner settings. These 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 is not crisp 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.

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