Canon CanoScan FB 630U User Manual - Page 51
Gamma, Channel, of values are 0.10 to 10.00, inclusive.
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chapter 5 What is on the ScanGear CS Main Window? Top Page Glossary Contents Index 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 Note 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. 51