User`s manual

5-7
Color drop-out - Apply exclusively when you need to scan as a
black and white image
The Color drop-out function allows you to remove one of the
R(Red), G(Green), or B(Blue) color or to convert all the color data
into Neutral Gray. For example, if you want to remove the text or
background in blue color, simply check the Blue Channel then
the text or background in blue color will be removed. If your
original contains various color data, then check the Neutral Gray
to retain all the color data in gray. Removing either one of the
red, green, or blue color will inadvertently affect the rest color
data as every color contains different elements of each of the
red, green, and blue channel. See the result below:
Your original with blue color background After click the B(Blue) channel
Your original with red watermark After click the R(Red) channel