Canon IMAGEFORMULA P-150 - Manual (Page 50)

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If [Skip blank page] is selected, the [Setting] button is enabled, and
you can adjust the level for judging whether pages are blank.
When you do not want to scan colored lines and
characters
Specify the color (red, blue, or green) to be ignored (dropped out) in
the [Color drop-out] settings on the [Image processing] tab, and that
color will not be scanned.
When you want to enhance a particular color
Select the color (red) to be enhanced in the [Color drop-out] settings
on the [Image processing] tab, and that color will be enhanced.
When you want to enhance contours in images
Adjust the [Edge emphasis] setting on the [Image processing] tab.
When you want to reverse the black and white in scanned
images (TWAIN driver only)
Select [Reverse Image] on the [Image processing] tab. Scanned
images are output with black and white reversed.
Hint
If the scanner driver settings screen is opened from an ISIS
compatible application, [Reverse Image] is not displayed.