Fujitsu ScanSnap S500 Operator's Manual page 92

[Compression] tab
■ Compression rate:
Control the compression rate to specify the size of the file for the scanned image.
The compression rate is changed by moving the slider.
The larger the compression rate number is specified, the higher the compression rate is
set and the smaller the file size becomes.
ATTENTION
HINT
74
When the compression rate is increased, the quality of scanned images deteri-
orates.
If you select "Color high compression" mode on the [Scanning] tab, the file size
becomes far more smaller by increasing the compression rate.