Avision AV220C2 (300500003) - Manual (Page 33)

4.2.2 Other Image Options
Binarization This is the process of converting a
grayscale or color image to a bi-tonal
image. There are several different
methods of performing this conversion.
Two of the options are Dynamic
Threshold and Fixed Processing.
Dynamic Threshold: Selecting
Dynamic Threshold allows the scanner
to dynamically evaluate each document
to determine the optimal threshold value
to produce the highest quality image.
This is used to scan mixed document
containing faint text, shaded background,
or color background with a single setting.
If Dynamic Threshold is selected,
Threshold, Brightness, and Contrast are
not available.
Fixed Processing: Used for black-and-
white and other high contrast documents.
A single level is set to determine the
black-and-white transition. The threshold
is programmable over the entire density
range. Fixed Processing sets Contrast
to 0. If Fixed Processing is selected,
Contrast is not available.
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