Operation Manual

User Guide – IRIScan

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