Canon FB636U User's Guide download pdf (Page 51)

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Glossary

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chapter 5

What is on

the ScanGear CS

Main Window?

When the Gamma button is clicked, the Gamma sheet is

displayed.

Gamma refers to a process where mid-tones are shifted so that the

lighter colors are lightened and darker colors are darkened. For

example, let us say you scanned a photograph of a subject in a

boat in a tree-lined lake and the shadows of the trees are dark

enough and the white of the boat is light enough, but the blue in

the sky, the blue of the water, and the blue of the subject’s

clothing all look the same. By increasing the Gamma value of the

image, the sky might become lighter and the water darker, giving

a better contrast to the image.

Gamma can be set even if there is no image in the

Preview Area. The gamma setting will remain in effect

for the next image previewing or scanning.

Gamma

Slide the Gamma slider to the left or right to set the gamma value

or you can type the value directly into the box. The allowed range

of values are 0.10 to 10.00, inclusive. Lager Gamma values darken

the mid-tones of an image, and smaller Gamma values lighten the

mid-tones. The shape of the tone curve changes to reflect the

current gamma setting for the current Channel, and the image in

the Preview Area changes to reflect the adjustment.

Channel

Click the Channel down-arrow and select one of the primary colors

(Red, Green, Blue) for adjustment or leave the setting at Master to

adjust all colors.

Note

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Canon FB636U User's Guide Page 51