Fujitsu 5900C - fi - Document Scanner Operator's Manual page 200

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8.5 Page Edge Filler (ADF)
Unless otherwise specified, the background color is white. You can also
change it to the "Black background" using the scanner driver.
If you are using the TWAIN driver, do the following to change the back-
ground color to black: Select the [Option] button, and then select [Black
background] from [Automatic Size and Skew detection] on the [Rotation]
tab.
Note that if the Page Edge Filler is too wide, some characters in the vicinity
of the boundary may be cut out.
When "Automatic paper size detection" is set, "Page Edge Filler (Automatic
paper size detection)" automatically becomes valid instead of this setting.