I.R.I.S. IRIScan Pro 3 Wi-Fi User Guide - Manual (Page 65)

6-20
Background
Setting
This option allows you to set your scan background. Choice: White
Background, Black Background.
Note: For a sheet-fed scanner with an auto document feeder, this option
is currently available only in the “Auto crop” mode. For a scanner with a
flatbed platen, this option is available either in the “Auto crop” or the
“Fixed to Transport” mode.
White Background
Black Background