Canon MF8170c User's Guide download pdf (Page 137)

Setting Preferences and Scanning with ScanGear MF

3-33

Scanning

■ [Gamma]

By clicking , you can access the [Gamma] dialog box.

The gamma allows you to adjust the brightness of the image viewed on the

computer monitor to the brightness of the original document. The default is 2.2. You

will have to change this value if you are using a monitor with a different gamma

value. When you set the monitor’s gamma value, the scanner’s gamma value will

automatically be displayed in the formula (reciprocal equation of the monitor

gamma value) below.

1/ monitor gamma value = scanner gamma value

The gamma is active if [Color] or [Grayscale] is selected in [Color Mode].

To adjust the gamma diagrammatically, press .

NOTE

•

The monitor has characteristics (gamma values) for reproducing colors. The gamma

value of an average monitor is between 1.4 and 2.2, and reproduces colors in a

somewhat darker way than the original document.

Consequently, to correct the difference between the color in the original image and the

reproduction of the color by the monitor, you may need to correct the gamma value.

•

For the monitor’s gamma value, refer to the documentation of your monitor, or contact the

manufacturer of your monitor.

[Channel] Selects a color to adjust either [Red], [Green], or [Blue], or select

[Master] to adjust the three colors together.

[Gamma] Move the slider to the left to decrease or the right to increase the

contrast displayed in the middle of the tonal range (midtones) of the

image. You can also enter values (0.10 to 10.00).

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Canon MF8170c User's Guide Page 137