Canon Color imageCLASS MF8170c Software Manual page 141

■ [Threshold]
By clicking , you can access the [Threshold] dialog box.
If [Black and White] is selected in [Color Mode], the Color Settings buttons will
become the [Threshold] button.
NOTE
•
The brightness of color and grayscale images are expressed as a value between 0 and
255 but brightness of black and white images is expressed in terms of either black or
white including the parts of an image which are a color between the two. The boundary at
which black and white is divided is called Threshold.
•
By adjusting the threshold, you can sharpen characters in a text document and reduce
back-printing such as in newspapers.
[Threshold Level] Move the [Threshold] slider to the right to increase the threshold
value and thus reduce the white areas (black areas will increase).
Move the slider to the left to decrease the threshold value and thus
increase the white areas (black areas will reduce). You can also
enter a value (0 to 255).
[Reset] Resets all the current settings to their default values.
Setting Preferences and Scanning with ScanGear MF
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