Compression

Scanned image data can be compressed to decrease file sizes. When

 

Compression is specified, files transmitted from the scanner decrease

 

in size, thus allowing more images to be stored on the host PC.

 

Select a compression type in the Compression box in the Scanned

 

Document Name dialog box.

Compression cannot be used for some applications or image file formats. For example, you cannot use Compression for the bitmap format (*.bmp) used by Windows. Choose a compression form that is compatible to the one your application supports.

The following compression methods are available:

∙CCITT-G3—an old version of the CCITT compression standard which should be used only with older imaging systems. This can be used only for bitonal images.

∙CCITT-G4—the current industry standard. This can be used only for bitonal images.

∙JBIG—has a high compression rate for bitonal and grayscale images and significantly better compression rate for dithered images in comparison with CCITT-G4. However, JBIG does not have the same industry acceptance as CCITT-G4.

NOTE: For documents composed almost entirely of photographs scanned by Dither using G3 and G4 compression, the compressed file may be larger than the uncompressed file.

A-63055 December 1999

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