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User’s M anual
4- 28
4 .4 The Com pr ession Ta b
The Com pression t ab allows you t o com press your scanned
im age and choose the 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 often com pressed using
JPEG t echnol
ogy. Move t he JPEG Qu alit y slider t o the right or
left t o increase or decrease t he level of com pression. Not e t he
great er the 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 application does not support
the type of com pression form at , t hen either a warning
m essage will appear or the im age qualit y of the com pressed file
will not be accept able.
JPEG ( Joint Photographic 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 software
applications. On Microsoft Windows- based system s, a file with
the ext ension .j pg 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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