Blue is any of a number of similar colors. When it is a pure color from a single source, it corresponds with a wavelength range of about 420–490 nanometers. It is considered to be one of the three primary additive colors in RGB system; blue light has the shortest wavelength range of the three additive primary colors. The English language commonly uses "blue" to refer to any color from navy blue to cyan.

Blue in RGB system

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In the RGB color system, colors are formed by mixing a red, a green and a blue color. When talking about RGB, therefore, some people use blue to mean that specific blue, which varies in shade according to the device used to display the RGB color. Absolute color spaces based on RGB, such as sRGB define an exact color for this blue, which may differ from the actual blue used in a particular computer monitor.

Naming and etymology

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Blue in English

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@terrellowens interested in being Honorary Chair for Alzheimer's Blue Moon Gala May 2 in B-Lo, T.O.? BTW, Happy Belated Birthday!
dallas1214 (s dallas owczarek) Mon, 21 Dec 2009 18:41:13 -0000
@terrellowens interested in being Honorary Chair for Alzheimer's Blue Moon Gala May 2 in B-Lo, T.O.? BTW, Happy Belated Birthday!
@u32gc2 poweraide is blue...
alphavictor (Alan C) Mon, 21 Dec 2009 18:30:49 -0000
@u32gc2 poweraide is blue...
Ahora en nippix.org Roses are red, violets are blue, fuck you, whore: Just for the record, that night i was real fu... http://bit.ly/6fq7k5
_Debasteitor (Debasteitor) Mon, 21 Dec 2009 18:25:31 -0000
Ahora en nippix.org Roses are red, violets are blue, fuck you, whore: Just for the record, that night i was real fu... http://bit.ly/6fq7k5
How Cool! Blue moon coincides with New Year's Eve: http://bit.ly/6TlI1c via @addthis #fb
juanamak (Juana Makarenko) Mon, 21 Dec 2009 18:16:47 -0000
How Cool! Blue moon coincides with New Year's Eve: http://bit.ly/6TlI1c via @addthis #fb
@blue_0016 エソテリアも悲惨な有様で…がっかりです（´・ω・｀）　感情の摩天楼からすこし流してくれてもいいような気がします…。
xx17 (てうに) Mon, 21 Dec 2009 18:00:02 -0000
@blue_0016 エソテリアも悲惨な有様で…がっかりです（´・ω・｀）　感情の摩天楼からすこし流してくれてもいいような気がします…。
The Beacon Court Holiday tree - very blue!!! http://mynewyorkcityphotos.blogspot.com/2009/12/beacon-court-holiday-tree.html
NYCphotos (NYCphotos) Mon, 21 Dec 2009 17:59:30 -0000
The Beacon Court Holiday tree - very blue!!! http://mynewyorkcityphotos.blogspot.com/2009/12/beacon-court-holiday-tree.html

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