Epson Expression 800 User Manual - TWAIN 32 - Page 57

Applying Scanning Filters, Adjusting Image Quality,

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Filters are only available when you select a color or grayscale scan type. Scanning is slower when you use Descreening because of the computations required to process the image. Applying Scanning Filters SilverFast Lite can automatically adjust an image based on the type of original scanned. These automatic adjustments are called filters. From the Filter list, choose None or one of the following filters: Sharpen Descreening Automatically sharpens an image (makes it less blurry) by increasing the contrast between adjacent pixels. Sharpen is useful primarily for photographs and grayscale images. Be sure to adjust the size of your image before using the Sharpen filter. Counters the effect of the screen process on your image and turns the dots into a smoother pattern. Descreening is useful for scanning photographs and illustrations printed in newspapers or magazines to improve lost resolution or sharpness. If you use Descreening, don't enlarge the image as this could cause a moiré effect (strange patterns that appear in an image due to the spacing between the bands of dots). Adjusting Image Quality Page 57

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Adjusting Image Quality
Page 57
Applying Scanning Filters
SilverFast Lite can automatically adjust an image based on the type of
original scanned. These automatic adjustments are called filters.
From the Filter list, choose
None
or one of the following filters:
Sharpen
Automatically sharpens an image (makes it less
blurry) by increasing the contrast between adjacent
pixels. Sharpen is useful primarily for photographs
and grayscale images. Be sure to adjust the size of
your image before using the Sharpen filter.
Descreening
Counters the effect of the screen process on your
image and turns the dots into a smoother pattern.
Descreening is useful for scanning photographs
and illustrations printed in newspapers or
magazines to improve lost resolution or sharpness.
If you use Descreening, don’t enlarge the image as
this could cause a moiré effect (strange patterns
that appear in an image due to the spacing
between the bands of dots).
Filters are only
available when you
select a color or
grayscale scan type.
Scanning is slower
when you use
Descreening because
of the computations
required to process
the image.