Microtek ScanMaker 4700 User Manual page 76

Descreen
2. When the Descreen menu comes up, select the screen for your
needs, or choose Custom to set your own descreen options.
When the Descreen dialog box comes up, enter a value that
best corresponds to the dot quality of the original in which the
moiré is to be removed. You may use a screen finder to
measure the print screen lpi. Please contact your local print
shop for more information on how to obtain a screen finder.
Set a value from 50 to 85 if the original image has a coarse dot
pattern, as in images taken from a newspaper.
Set a value from 100 to 133 if the original image has a fine dot
pattern, as in images taken from a magazine.
Set a value from 200 to 250 if the original image has a very fine dot
pattern with a near-photographic quality, as in images taken from a
high-quality art magazine.
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