Microtek ScanWizard EZ Reference Manual 27
Threshold
The Threshold control is active only when the Type setting is ”Line Art” and the
“Auto Threshold” is unchecked in the Advanced Settings window. The default
Threshold is preset to 127.
Original
Threshold: 50
Threshold: 200
Threshold is the dividing point between black and white; the range is 0 to 255,
and the default is 127. Thus, gray levels below the Threshold are converted to
black, while gray levels equal to or above the Threshold are converted to white,
resulting in a high-contrast, black-and-white representation of the image.
•
To darken the original, drag the slider to the right or enter a value in the edit
box. This increases the Threshold value so that more pixels are turned to
black, resulting in a darker image.
•
To lighten the original, drag the slider to the left or enter a value in the edit
box. This lowers the Threshold value so that more pixels are turned to
white, resulting in a lighter image.
Uncheck the Auto Threshold to set up
the Threshold manually
To change the default Threshold
setting, you should disable the
“Auto Threshold” setting in the
Advanced Settings window. To do
this, click the Advanced... button
to open the Advanced Settings
window, uncheck “Auto
Threshold”, and click OK. Then
return to the control panel to drag
the slider, or enter a desired value
in the Threshold edit box.
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