Microtek ScanMaker 5 Guide de l'utilisateur télécharger pdf (Page 124)

5-50 Microtek ScanWizard 5 User's Guide (Macintosh version)

Threshold (for Line Art images)

For Line Art images, the Brightness & Contrast screen becomes the Threshold setting, and the

Threshold dialog box appears instead.

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.

To use the Threshold feature:

1. Drag the sliders 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.

2. Alternatively, you can enter a value in the

Threshold edit box to change the Threshold.

3. The Sharpen option lets you sharpen the Line

Art image.

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Microtek ScanMaker 5 Guide de l'utilisateur Page 124