Oki S900 - Manual (Page 42)

USING THE S900 AS A SCANNER > 42
Lightness—specify a value in the Lightness box to adjust the color
strength.
Color drop-out
This feature is available when Black and White, Halftone, or
8-Bit Gray is selected on the
Image Type drop-down menu.
Click on the Color Drop-out button to access a dialog box
that allows you to choose to remove the R (Red), G (Green),
or B (Blue) color channel while scanning.
For example, if your image contains red text or a red background,
choose
R channel (red) to remove the red text or red background.
Increasing the brightness after removing one of the color channels
will make the image clearer.
This function is particularly useful when you have to convert text using
OCR software.
NOTE
These options are available only when the Color Adjustment button is
enabled.