Avision AM7100N (MT-0904B) - Manual (Page 111)

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.
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