FUJITSU fi-4120C2 - Manual (Page 54)

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4. With the slider control under [Blank Page Skip], specify the Blank Page Skip degree.
For white pages, use the [Black Dots Ratio] slider bar to set the skip condition. For black
pages, use the [White Dots Ratio] scroll bar to set the skip condition.
The value displayed to the right of the scroll bar displays the noise ratio(*1). If a scanned
document is below this value, it is recognized as a blank page. The setting range is OFF(- -)
and 0.2% to 3.0% (in increments of 0.2%).
*1: Ratio of black dots included in the scanning area. (for white pages)
Use the slider bar to set the skip condition in five stages from 1 to 5. To make the blank
pages easy to skip, increase the value of the setting.