Avision AD345FN User Manual

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Use r’s Man ua l

4- 28

4 .4 The Com pression Tab

The Com pression tab allows you t o com press your scanned

im age and choose t he level of com pression. Bi- tonal im ages

are norm ally com pressed using CCI TT standard called Group 4

( G4). Color and grayscale im ages are often com pressed using

JPEG technol

ogy. Move the JPEG Qualit y slider t o t he right or

left t o increase or decrease the level of com pression. Note the

greater the com pression level, t he lower im age qualit y. Default

is 50% .

Not e that the com pression depends on your im age edit ing

applicat ion. I f your im age edit ing applicat ion does not support

the type of com pression form at, t hen eit her a warning

m essage will appear or t he im age qualit y of t he com pressed file

will not be accept able.

JPEG (Joint Photographic Edit or Group) . This group developed

and lent t heir nam e t o a file com pression st andard for color and

grayscale im ages that is widely used by scanners, and soft ware

applicat ions. On Microsoft Windows- based syst em s, a file wit h

the extension .jpg has norm ally been com pressed using this

st andard.

For scanning color or gray im ages, t he following com pressions

are available:

 None

 JPEG

For scanning B&W im ages, t he following com pressions are

available:

 None

 G4

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Avision AD345FN A New Generation of Document Scanner