Microtek ScanMaker E3 SCSI Manuel d'utilisateur télécharger pdf (Page 112)

5-57Reference: The Settings Window

In line art mode, the method for determining how gray levels are converted to black and

white is through the Threshold adjustment control.

The threshold is the dividing line between black and white, with the value 128 (the

middle gray level) as the determining point.

• Gray levels below the threshold are converted to black, resulting in a low-contrast,

black-and-white representation of the image.

• 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, do either of the following:

• Enter a value in the Threshold edit box; or

• Drag the black triangle above the threshold edit box to the right or left. Moving it to the

right will increase the threshold value, resulting in a higher-contrast image. Moving it

to the left will lower the threshold value, resulting in a lower-contrast image.

The BCE screen (for line art)

Threshold

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 169 170

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Microtek ScanMaker E3 SCSI Manuel d'utilisateur Page 112