Fujitsu ScanSnap S1500M Operator's Manual page 26

The following shows the estimated file size when scanning one side of a color
document.
File format
PDF
Automatic
Color mode
resolution
Color 438.4
Gray 393.4
B&W 175.8
Compression rate
3
Estimated image data size (KB)
Normal
295.1
264.3
112.0
26
System Requirements
Paper size
A4 (catalog)
Better Best
442.4 859.3
390.0 753.1
183.5 352.1
Excellent
2921.4
2500.4
1630.2