Avision AD345 SERIES User Manual

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Use r’s M anual

4- 28

4 .4 The Com pression Ta b

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

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

are norm ally com pressed using CCI TT st andard called Group 4

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

JPEG technol

ogy. Move the JPEG Qualit y slider to the right or

left to increase or decrease the level of com pression. Not e t he

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

is 50% .

Note that the com pression depends on your im age edit ing

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

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

m essage will appear or t he im age quality of the com pressed file

will not be accept able.

JPEG ( Joint Phot ographic Editor Group). This group developed

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

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

applications. 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 AD345 SERIES A Fast and Affordable Scanner