User`s guide

Appendix A:Scanner and Printer Specific Features
88 - ScanShop User’s Guide
Board is installed. For more information, please see the “Image Processing
Circuit Board” section below.
Bits Per Pixel
Three levels of bits per pixel are offered: 1 bit/pixel for black and white and
8bits/pixel for gray scale.
Brightness
The brightness slider bar varies the brightness of the image, ranging from darkest
on the left to lightest on the right.
Contrast
The contrast slider bar allows you to vary the image contrast. Sliding the bar to
the right increases the contrast.
Threshold
The Fujitsu scanner supports two kinds of threshold controls: regular (or static)
threshold and dynamic threshold. Static threshold corresponds to the most
generally used kind of thresholding, where at an established level, all lighter
pixels become white and all darker pixels become black. The slider bar allows
you to select 64 threshold levels.
The Dynamic Thresholding feature is available only when the optional Image
Processing Circuit board is installed. If the board is not installed, the Dynamic
Thresholding checkbox is disabled. (Please see the “Image Processing Circuit
Board” section below.)
Dynamic Thresholding uses a variable threshold level. It is especially useful in
the scanning of signatures which consist of variable line weights. Dynamic
Thresholding automatically adjusts the threshold to extract lightly stroked
handwritten characters. It does this by analyzing the reflected light from the page.
If there is a small variation in the signal, indicating a faint line, the scanner
reduces the threshold setting to a point where it can distinguish between the faint
line and the background.