Canon iR3245 Manual page 400

If the optional System Upgrade RAM is installed to expand the memory
capacity of the machine:
Press [Fine Adjustment].
Press [-] or [+] to specify the amount of each colour that you want to remove →
press [OK].
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For example, if the background colour (yellow) of the original remains, press [-] next to
<Yellow> to adjust the density.
Adjusting Yellow automatically adjusts the levels of Red and Green to the same level as
Yellow. However, Adjusting the levels of Red or Green sets Yellow back to its default level.
Pressing [-] or [+] adjusts the density of each colour. Press [-] to make the colour lighter, or press [+] to
make the colour darker.
If you make fine adjustments to the density, the automatic scan exposure setting is cancelled, and the
original is scanned according to the Fine Adjustment settings.
If the optional System Upgrade RAM is not installed:
Press [Fine Adjustment].
Press [-] or [+] to specify the amount of colour that you want to remove →
press [OK].
Pressing [-] or [+] adjusts the density of colour. Press [-] to make the colour lighter, or press [+] to make the
colour darker.
If you make fine adjustments to the density, the automatic scan exposure setting is cancelled, and the
original is scanned according to the Fine Adjustment settings.
4-146 Remove Background