Canon imageFORMULA DR-C225 II Document Scanner - Manual (Page 75)

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Select [Advanced Text Enhancement II] in the [Color mode] setting. The
background behind the text is removed or processed so that the text is
emphasized for better readability.
When you want to detect multiple pages fed at
the same time
Select the [Double Feed Detection] check box on the [Feeding] tab. You
can enable either one or both of [Detect by Ultrasonic] and [Detect by
Length].