The TWAIN Interface 21
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2.2.2.4
Filter
Filters help you improve your scans by allowing you to sharpen images as well as
remove excessive dots and distortion.
The following options are available from the drop-down list:
-- Applies no filter in the scanned image.
Determines the medium depth of an image and averages adjacent
pixels to make images appear
Dulls the edges within an image and decreases the contrast by making
dark edges lighter and light
Allows you to sharpen the edges within an image by making the
edges in an image more distinct. The Sharpen filter also increases contrast by
making dark edges darker and surrounding light edges lighter.
Adds additional sharpening.
Sharpens the edges in an image to remove the blurriness.
This setting is not available when
The application of a filter can greatly reduce the scanning speed
2.2.2.5
Gamma
Image Gamma is used to adjust the colors in the image that will be scanned into
Gamma values follow a smooth curve.
By adjusting the gamma, you
can change the tonal range of the selected color channel.
primarily a measure of the brightness of a color. The larger the gamma value, the
brighter the color becomes.
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