Avision AV220 - Manual (Page 39)

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4.2.6 Color Drop-out
Click the button and a dialog box in below will be
displayed. This dialog allows you to remove one of the
R (Red), G (Green), or B (Blue) color channel. This
function is particularly useful when you need to
convert text using OCR software.
Note that this function supports only black & white and
gray image. Therefore, be sure to choose any black &
white or gray image type while applying this function.
The effect on image after removing the G channel.
The effect on image after removing the R channel.