Microtek ScanMaker IIG User Manual page 19

The table below shows optimal resolution settings for most needs. MPR below
stands for "Match Printer's Resolution."
Output Device
Black & white
laser printer
Color desk jet, ink jet,
thermal printer
Color dye-sublimation
printer
Printing press or
imagesetter
Remember that the higher the resolution, the larger your image
file will be. For instance, an 8.5" x 11" color photograph scanned
at 75 dpi takes up about 1.6 megabytes (MB). Doubling resolu-
tion to 150 dpi will increase the file size four times — to approxi-
mately 6.3MB! Going to 300 dpi will increase file size to
26.2MB.
What you need to do then is to select the lowest possible resolu-
tion that still gives you good image quality in order to keep file
sizes manageable.
Comparison of images at different resolutions
The two images were scanned at different resolutions, but
there isn't much difference in the printed result. This is because
all printers and presses have their own maximum resolution.
It's also because the final size is so small that anything over
150 dpi is really unnecessary.
1-10 Microtek User's Guide for Windows
Line Art Grayscale
MPR 75 dpi
MPR 100-150 dpi
MPR MPR
MPR 150-300 dpi
300 dpi
150 dpi
Color
75 dpi
100-150 dpi
MPR
150-3200 dpi