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User Guide IRIScan
TM
Executive 4
2.4 The Compression Tab (Windows PC only)
The Compression tab allows you to compress your scanned image and choose the level of compression. Bi-
tonal images are normally compressed using CCITT standard called Group 4 (G4). Color and grayscale
images are often compressed using JPEG technology. Move the JPEG Quality slider to the right or left to
increase or decrease the level of compression. Note the greater the compression level, the lower image
quality. Default is 50%.
Note that the compression depends on your image editing application. If your image editing application
does not support the type of compression format, then either a warning message will appear or the image
quality of the compressed file will not be acceptable.
JPEG (Joint Photographic Editor Group). This group developed and lent their name to a file compression
standard for color and grayscale images that is widely used by scanners, and software applications. On
Microsoft Windows-based systems, a file with the extension .jpg has normally been compressed using this
standard.
For scanning color or gray images, the following compressions are available:
None
JPEG
For scanning B&W images, the following compressions are available:
None
G4
The Compression tab dialog box
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