Glossary
Energy Star Computers Program
An energy conservation program launched by the US Environmental Protection Agency (EPA),
promotes the manufacture and marketing of energy-efficient office automation equipment.
Companies joining this program, must be willing to commit themselves to manufacture one or more
products capable of going into a low -power state (< 30 W) either after a period of inactivity, or after
a predetermined time selected by the user.
Gamma
Screen luminance as a function of video voltage approximately follows a mathematical power
function of the input video signal, the exponent of which is called gamma.
Grayscale
An achromatic scale ranging from black through a series of successively lighter grays to white.
Such a series may be made up of steps, which appear to be equally distant from one another. If the
Analog/ Digital converter is 8 bit, then the monitor can display at most 2
8
= 256 levels. For a color
monitor, R.G.B. each color hads 256 levels. Thus, total color can display is 256x256x256= 16.7
million.
Hue
The main attribute of a color that distinguishes it from other colors. For example, a color may have a
green, yellow, or purple hue. Color defined as having hue are know as chromatic colors. White,
black, and grays possess no hue.
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