Operation Manual

16
User Guide – IRIScan
TM
Executive 4
2.5 The Color Dropout Tab
2.5.1 Color Dropout Selection
Color Dropout tab allows you to drop either of the red, blue, or green color in your scanned image. If your
image contains red color watermark or background, choose the R (Red) channel then any red watermark or
background will be removed. This feature is used to sharpen your text when using OCR (Optical Character
Recognition) software.
The “Custom” option allows you to specify your desired color to be removed by entering its RGB (Red,
Green, and Blue) value respectively.
Tolerance: Specify the allowable color range to be removed for the color you selected. Specified range: 1 ~
100
The large the numeric value, the wider the color dropout range is.
Note that this function supports only black & white and gray images. Therefore, be sure to choose any
black & white or gray image type while applying this function.
The Color Dropout dialog box
2.5.2 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.