Fujitsu Ricoh Fujitsu N7100E Network Image Scanner - Manual (Page 290)

5.8 Setting the Scan Options
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5.8.11 Thresholding
The sensitivity for outputting scanned data in black and white can be set.
Clear scanned image output can be obtained from documents with dark background.
1. Select [Thresholding] under [Image Correction] on the scan settings
window.
 The [Thresholding] window appears.
2. Specify each item.
3. Press the [OK] button.
 The information entered is set.