I.R.I.S. IRIScan Pro 3 Cloud Button Manager - Manual (Page 32)

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4.6.2 The Color Dropout Tab
From the Scan Configuration Properties window, click Color
Dropout tab to prompt the Color Dropout window. 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
image. Therefore, be sure to choose any black & white or gray
image type while applying this function.
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.