I.R.I.S. IRIScan Pro 3 Wi-Fi User Guide - Manual (Page 56)

User Guide
6-11
6.3 The Compression Tab
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