Blue

The term blue may refer any of a number of similar colours. When blue is a pure colour from a single source, it corresponds with a wavelength range of about 440–490 nanometers. more...

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Blue is considered to be one of the three primary additive colours in the RGB system; blue light has the shortest wavelength range of the three additive primary colours. The English language commonly uses "blue" to refer to any colour from navy blue to cyan. The complementary colour of blue is yellow.

Blue in the RGB system

In the RGB colour system, colours are formed by mixing a red, a green and a blue colour. 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 colour. 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

Blue in English

The modern English word blue (German:blau) comes from the Middle English, bleu or blwe, which came from an Old French word bleu of Germanic origin (Frankish or possibly Old High German blao, "shining"). Bleu replaced Old English blaw. The root of these variations was the Proto-Germanic blæwaz, which was also the root of the Old Norse world bla and the modern Scandinavian word blå. It can also be green or orange occasionally(blue). A Scots and Scottish English word for "blue-grey" is blae, from the Middle English bla ("dark blue," from the Old English blæd).

As a curiosity, blue is thought to be cognate with blond and black through the Germanic word. Through a Proto-Indoeuropean root, it is also linked with Latin flavus ("yellow"; see flavescent and flavine), with Greek phalos (white), French blanc (white) (loaned from Old Frankish), and with Russian белый, belyi ("white," see beluga), and Welsh blawr (grey) all of which derive (according to the American Heritage Dictionary) from the Proto-Indo-European root *bhel- meaning "to shine, flash or burn", (more specifically the word bhle-was, which meant light coloured, blue, blond, or yellow), from whence came the names of various bright colors, and that of colour black from a derivation meaning "burnt" (other words derived from the root bhel- include bleach, bleak, blind, blink, blank, blush, blaze, flame ,fulminate, flagrant and phlegm).

In the English language, blue may also refer to the feeling of sadness. "He was feeling blue". This is because blue was related to rain, or storms, and in Greek mythology, the god Zeus would make rain when he was sad, and a storm when he was angry.

Read more at Wikipedia.org