From Wikipedia, the free encyclopedia Red

Template:Swatch Red is a color at the lowest frequencies of light discernible by the human eye. Red light has a wavelength of roughly 700 nm. Oxygenated blood is red due to the presence of hemoglobin. Red light is the first to be absorbed by sea water, so that many fish and marine invertebrates that appear bright red, are black in their native habitat.

Red is an additive primary colour, complementary to cyan. It was once considered to be a subtractive primary colour, and is still sometimes described as such in non-scientific literature; however, the colours cyan, magenta and yellow are now known to be closer to the true primary colours detected by the eye, and are used in modern colour printing. But in the RGB color model used on TV sets and computer monitors, red is one of the three channels, designated R.

Lower frequencies are called infrared, or far red.

A red filter used in black and white photography increases contrast in most scenes. For example, combined with a polarizer, it can turn the sky black. Films simulating the effects of infrared film (such as Ilford's SFX 200) do so by being much more sensitive to red than to other colors.

Usage, symbolism, colloquial expressions Edit

  • Red catches people's attention, and is often seen as a sign of danger: it is thus used for warning signs.
    • The color red is often used to denote anger as in seeing red.
    • The color of blood led red to be associated with the god of war, Mars, and the reddish planet Mars became named for him.
    • Red is used to denote "stop" in traffic signs and traffic signals.
    • In auto racing, a red flag signals all cars to immediately stop.
    • Red, along with yellow and orange, is thought to provoke hunger, hence its use in logos by food vendors.
  • Red is the color of love, both in the red hearts of a valentine, and in a "red-light district".
  • Red is one of the Christmas colors.
  • Beginning with the Revolution of 1848, "Socialist" red was used as a color of European Revolutionaries, like Garibaldi's camicie rosse ("redshirts") in the Italian Risorgimento, and taken up by Leftist and generally radical groups, while the white of legitimist Borbon partisans became associated with pre-World War I conservatives.

Color coordinates Edit

In various color spaces, the color red is specified as follows:

Model Coordinates
Hex triplet #FF0000
RGB (255, 0, 0)
CMYK (0, 255, 255, 0)
HSV (0, 100, 100)

Variations Edit

  • Scarlet - a shade of red that tends towards red-orange and has no hint of blue
  • Vermilion - a fiery shade of red that tends toward red-orange to a silghtly greater degree than scarlet, prepared from cinnabar, the artificial red sulphide of mercury used as a pigment
  • Crimson - a shade of red that has no hint of yellow and leans towards red-violet
  • Venetian Red (also known as India Red and Indian Red) - A shade of brownish red prepared from sulphate of iron.
  • Fire Engine Red - A shade of bright red commonly used on emergency vehicles
  • "Jungle Red" was the nailpolish color in The Women.
  • Rose is a range of colors on the blue side of red.
  • Peach is a range of colors on the yellow side of red and generally tending toward a light shade.


See also Edit

ca:Roig cs:Červená da:Rød de:Rot el:Κόκκινο es:Rojo eo:Ruĝa fr:Rouge he:אדום (צבע) nl:Rood ja:赤 pt:Vermelho simple:Red fi:Punainen sv:Röd zh-cn:红色