See also waveform, white point.

A measurement of the midpoint in the luminance range of an image. Used in color adjustments to control the proportions of brighter and darker areas in an image. Also called the gray point.

Any combination of multiple tracks that are grouped. An edit that is performed on one track is also performed on tracks that are ganged together.

The number of times material has been rerecorded. The original videotaped material is the first generation. A copy of the original is a second-generation tape, and so on. Each generation shows a gradual loss of image quality. With digital copies, there is little or no loss in quality.

In Broadcast, a system whereby the internal sync generator in a device (such as a camera) locks onto and synchronizes itself with an incoming signal.

Approximately one billion bytes (1,073,741,824 bytes) of information.

General-purpose interface. In computerized editing systems, GPIs allow the computer to control various remote components.

See gamma.

See blue screen.

Graphical user interface. The graphic image on the screen containing representations of buttons, sliders, and dials; used to control the editing process.