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A-63055 December 1999 37
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.