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User’s M anua l
4- 29
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 CCITT standard called Group 4
( G4) . Color and grayscale im ages are oft en com pressed using
JPEG t echnology. Move t he JPEG Qualit y slider t o t he right or
left t o increase or decrease t he level of com pression. Note t he
great er t he com pression level, t he lower im age qualit y. Default
is 50% .
Not e that t he com pression depends on your im age edit ing
applicat ion. I f your im age edit ing applicat ion does not support
t he t ype of com pression form at, t hen eit her a warning m essage
will appear or the im age quality of the com pressed file will not
be acceptable.
JPEG ( Joint Phot ographic Edit or Group) . This group developed
and lent t heir nam e t o a file com pression standard for color and
grayscale im ages t hat is w idely used by scanners, and soft ware
applications. On Microsoft Windows-based system s, a file wit h
t he ext ension .j pg has norm ally been com pressed using t his
st andard.
For scanning color or gray im ages, t he follow ing 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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