Epson 600 User Manual page 58

Advanced Scanning
Note:
Filters are only
available when you
select a color or
grayscale scan type.
Note:
Scanning runs slower
when the Descreen
filter is used because
of the intensive
computations required
to process the image.
From the Filter drop-down list, choose one of the
following:
Sharpen
Descreen
The scanner software has a
sophisticated sharpening feature that
automatically sharpens an image
(makes it less blurry) by increasing
the contrast (distinction between
dark and light tones) between
adjacent pixels.
This is the default filter and is useful
primarily on photographs and
grayscale images.
When photographs and illustrations
are printed in newspapers or
magazines, they are "screened"—a
process that turns images into tiny
dots. (If you look at a photograph in a
newspaper with a magnifying glass,
you'll see that the image is actually
composed of many small dots.)
If you are scanning an image that has
been previously screened, you can
sometimes get undesirable results,
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