G

gamma

A curve that describes how the middle tones of an image appear. Gamma is a nonlinear function sometimes confused with brightness or contrast. Changing the value of the gamma affects middle tones while leaving the whites and blacks of the image unaltered. Gamma adjustment is often used to compensate for differencses between Macintosh and Windows video cards and displays.

gamut

The range of colors an individual color device is capable of reproducing. Each device capable of reproducing color has a unique gamut determined by age, frequency of use, and other elements such as inks and paper. See also device characterization, device dependent, ICC profile.

gamut mapping

The process of identifying colors outside a device's gamut and then calculating the nearest colors within its gamut. See also color space.