Avision av121b 사용자 설명서

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4.4.2  Other Color Dropout Options 
 
Advanced Processing provides two options that can adjust 
your scanned image in the best optimal result. 
 
Filter 
Threshold 
This value is used to determine the color 
which will be dropped out.  A lower value will 
drop more of the selected color out, while a 
higher value will leave more of the selected 
color in. 
Background 
Level 
The pixel which is higher than the 
background value will be adjusted to the 
lightest point.  Adjust the value for both the 
Filter Threshold and Background Level to 
produce the best optimal result. 
 
Example, slightly adjusting the background value makes 
your text more clear.  
 
 
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