Microtek ArtixScan 4500t, Справочное руководство

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112 Microtek ScanWizard Pro for Macintosh
Threshold tool
(Line Art images only)
3
Check this box if
you wish to
sharpen your
Line Art image.
Aside from dragging
the sliders, you can
also enter a value in
the Threshold edit box
to change the
Threshold.
Drag the slider to change the Threshold.
• To darken the original, drag the slider to the
right. 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.
This lowers the Threshold value so that more
pixels are turned to white, resulting in a lighter
image.
For Line Art images, the only AIC tool available is the Threshold tool.
Threshold is the dividing line between black and white; the range is 0 to 255,
and the default is 128. 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.