This article is about the colour; for other uses of "grey" or "gray", see Grey (disambiguation).

Grey or gray (see spelling differences) is a colour seen commonly in nature. In pigment, or subtractive colour (CMYK), it is created by adding black. In light, or additive colour (RGB), it is created by adding equal amounts of R, G, and B, with R,G,B greater than 0% and less than 100% (greater than 0 and less than 255, in the 8-bit notation commonly used in computing). Depending on the colour temperature of the light (measured in kelvins of a black body radiator), the human eye can interpret the same object as either grey or some other colour, with colder light adding a yellow-orange hue and warmer light adding a blue hue.

Two colours are called complementary colours if grey is produced when two colours are combined. Grey is its own complement. Consequently, grey remains grey when its colour spectrum is inverted, and therefore has no opposite, or alternately is its own opposite.

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Wiley: All New Reference Titles

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James Pyles Mon, 31 Mar 2008 04:00:00 -0000
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