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C. Resolution unit
The unit of measurement for resolution is in ppi (pixels per inch) which is most
commonly used as a measure of image resolution. The dot (pixel) size indicates
how big the dot (pixel) will be when a resolution setting is given in the Resolution
edit box, together with the resolution unit "ppi". For instance, if your image will
be scanned at 200 ppi, the dot size will be 0.127 mm; and at 400 ppi, the dot
size will be 0.0635 mm.
If your scanned images are intented for on-screen display, you need not go
higher than the target resolution of your monitor (usually 96 dpi for Windows).
A higher resolution value will simply increase the file size of your image without
any perceptive improvement in image quality.
ScanWizard Industry Reference Manual
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