Avision FB2100_Green (BF-0505) - Manual (Page 36)

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3.4 THE COLOR DROPOUT TAB
3.4.1 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.
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