Learn more about Red
|— Color coordinates —|
|RGBB||(r, g, b)||(255, 0, 0)|
|CMYKH||(c, m, y, k)||(0, 100, 100, 0)|
|HSV||(h, s, v)||(0°, 100%, 100%)|
| B: Normalized to [0–255] (byte)|
H: Normalized to [0–100] (hundred)
Red may be any of a number of similar colors at the lowest frequencies of light discernible by the human eye. Red is one of the three primary colors of visible light, the others being green and blue. Red light has a wavelength range of roughly 625–760 nm. Frequencies lower than this are called infrared, or below red and cannot be seen by human eyes, although some infrared frequencies can be felt as heat.
Red is an additive primary color of light, complementary to cyan. It was once considered to be a subtractive primary color, and is still sometimes erroneously described as such in non-scientific literature; however, the colors cyan, magenta and yellow are now known to be closer to the true subtractive primary colors detected by the eye, and are used in modern color printing.
One common use of red as an additive primary color is in the RGB color model. Because "red" is not by itself standardised, color mixtures based on red are not exact specifications of color either. In order to produce exact colors the color red needs to be defined in terms of an absolute color space such as sRGB. As used in computer monitors and television screens, red is very variable, but some systems may apply color correction (so that a standardised "red" is produced that is not in fact full intensity of only the red colorant). In HSV color space, red has a hue of 0° or 360°.
 Red in culture
- Red catches people's attention, and is often used to indicate danger or emergency.
- Red symbolizes heat and fire. Taps for hot water are often labeled red. Red is commonly the color of fire alarm boxes, fire extinguishers, and the firefighter profession itself.
- Red denotes "stop" in, for instance, stop signs, traffic signals, brake lights, or the flashing lights of a school bus.
- Red is the color of blood, and a Red Cross, Red Crescent or Red Crystal emblem signifies medical personnel, facilities, or equipment, or the Geneva Conventions.
- Red indicates extreme danger on Western color-coded scales, such as wildfire hazard signs or the U.S. Homeland Security Advisory System. It also denotes the maximum level of danger and preparedness as in the phrases condition red and red alert.
- In auto racing, a red flag signals all cars to immediately stop.
- The redline is the maximum speed an engine and its components can safely run.
- Emergency exits on passenger aircraft are indicated by red signs and lighting.
- "Redlining" is delineating a forbidden area (as on a map), for instance where a company denies or increases the cost of services, and is illegal in various circumstances in the U.S.
- With ships on collision courses, the ship on starboard tack sees the Green for Go light on the ship on port tack, while the ship on port tack sees the Red for Stop light on the ship on starboard tack.
- Rosso corsa is the traditional color of Italian race cars.
- Being the color of blood, red was associated in Roman mythology with the god of war, Mars, and the reddish planet Mars became named after him. The phrase "red-blooded" describes someone who is audacious, robust, or virile; it is sometimes used to contrast with a cold or effete "blue blood" although the terms are unrelated in origin.
- Red is the color of the passion (emotion), romance and sex, (because of its association with blood, which is responsible for arousal) thus the red of a Valentine heart and of a "red-light district". It also represents the female menstrual cylce and therefore maturity and sexuality. Paradoxically, it also denotes anger, as in the expression seeing red, or embarrassment, as in being red-faced (many of these effects themselves caused by the blood rushing to the brain from adrenaline).
- In the FIFA World Cup, red is the color of victory in South Korea.
- Red is considered holy in some parts of sub-sahara Africa. In these regions women are forbidden to wear red clothes.
- Before the French revolution red was the color of the flag signifying the imposition of martial law.
- In ancient China, red was the symbol of South and Fire, one of the main five colors.
- In Chinese symbolism, red is the color of good luck and is used for decoration and wedding attire. Money in Chinese societies is traditionally given in red packets.
- Red is one of the Christmas colors, with green, white, or both.
- Red, along with yellow and orange, is thought to provoke hunger, hence its use in logos by food vendors.
- In some East Asian countries, the names of the deceased are written in red ink in a Book of the Dead. To write a living person's name with red ink is taboo, tantamount to placing a curse on the person
- In Christianity, red represents the color of fire and so symbolizes the presence of God. It is the liturgical color for Pentecost. It is also considered the color of the Roman Catholic Church, since red can also symbolize the blood of martyrs. It is sometimes used for Holy Thursday and during Eastertide. In Roman Catholic tradition it is used for Palm Sunday in anticipation of the death of Jesus.
- Red ink is also used to denote debt - as well as losses on a balance sheet (hence the phrase, "in the red" usually indicates economic losses).
- In North American stock markets, red is used to denote a drop in stock prices. In East Asian stock markets, red is used to denote a rise in stock prices.
- In Association football (soccer), the referee shows a Red card (sports) to a player who is being sent-off.
- Red can sometimes symbolize evil in any kind of work that involves a villain because Satan is often depicted as wearing a red costume.
- In English heraldry, red (called gules) denoted ardent affection or love, while crimson (blood-color) stood for boldness, enthusiasm, or impetuosity. (The American Girls Handy Book, p. 369-370)
- Red is the color claimed by the street gangs Bloods and Norteños.
- Red is an album by progressive rock band King Crimson.
- The 1977 album by Sammy Hagar called Sammy Hagar and featuring his hit song Red shows Sammy Hagar dressed in red surrounded by people dressed in red, red cars, and red buildings.
- In the handkerchief code of the gay leather subculture, wearing a red bandana indicates one is into fisting.
- Red is the color of the lowest-value balls in snooker. There are 15 at the beginning of a game, each worth 1 point.
- Red Indians is a British term for Native Americans.
- Red can also refer to red people or the indigenous peoples of the Americas.
 Military and politics
- Red is the color often used for the Ancient Roman Empire. It has been said that Roman officers would wear red so that if they were wounded, it would not discourage their troops nearby.
- In the history of Japan red is the color of military flags used by the Heike (or Taira) clan and of the Genji (or Minamoto) clan, two clans that struggled for power at the close of the Heian era, in the late 12th century.
- In the United States Army, red is the color of the artillery and the U.S. Army Corps of Engineers. Brick red is the color of the United States Army Transportation Corps, while crimson is the color of the Ordnance Corps, and Maroon is that of the Medical Corps.
- In the Finnish Army, red is the color of artillery. Black symbols on a red field signify field artillery, white symbols signify anti-aircraft artillery.
- Red is the color commonly associated with the British and British Army (e.g., Redcoats) and is also used to describe someone of British nationality.
- Red, in wargaming is depicted as a hostile force; originating from Helmut von Moltke. Blue would represent friendly forces, thus the phrase blue on blue fire comes to mean friendly fire.
- Beginning with the Revolution of 1848, "Socialist" red was used as a color of European Revolutionaries, often in the form of the red flag. It was also used by Garibaldi's camicie rosse ("redshirts") in the Italian Risorgimento, and taken up by Leftist and generally revolutionary groups, while the white of legitimist Bourbon partisans became associated with pre-World War I conservatives. This relates to the term "Blood of the workers", representing the suffering of the proletariat.
- For instance the Civil War in Russia and the Civil War in Finland were fought between the "Red Army" and various "White Armies".
- The identification of Communism with "Socialist" red (with the red flag being the primary color of the flag of the Soviet Union) and the red star being a Communist emblem led to such Cold War phrases as "the Red Menace" and "Red China" (distinguished from Nationalist China, "Free China," or Taiwan). See also The East is Red. Mao Zedong was sometimes referred to as a "red sun". The color was also associated with political vehicles such as the Red Guard in China and the Red Guards during the Russian Revolution of 1917 as well as with left wing paramilitary terrorist groups such as the Red Army Faction in Germany and the Japanese Red Army.
- Red remains associated with parties on the left of the political spectrum, with several notable exceptions (see "Political Parties" below)
- Red is the national color of Wales
- Red is the color of the coat of arms of Ħamrun, Malta.
- Red and black are colors associated with anarchism, and, specifically, anarcho-syndicalism.
- Red and black are also the national colors of Angola.
- In maps of political parties, red is traditionally used for the following parties:
- Australia: Labor
- Brazil: Workers' Party
- Canada: Liberal Party of Canada
- Finland: Social Democratic Party of Finland
- Germany: Sozialdemokratische Partei Deutschlands (Social Democratic party of Germany) and Partei des Demokratischen Sozialismus (Party of Democratic Socialism)
- Malta: Malta Labour Party
- New Zealand: New Zealand Labour Party
- The Netherlands: Partij van de Arbeid (Social Democratic party), Socialistische Partij (Socialist Party)
- Portugal: Portuguese Communist Party (and the Unitarian Democratic Coalition, of which the PCP is part of)
- Sweden: Swedish Social Democratic Party and the Left Party (Sweden)
- United Kingdom: Labour Party
- United States: Republican Party, since the 2000 presidential election, when contrasted with blue representing Democratic Party.
- In the United States wearing red clothing is promoted by some groups to symbolize support for or opposition against the Iraq War, or to spread awareness about heart disease. See: Red Friday
- Red is also used to symbolize AIDS awareness or Drug awareness, in the form of a red ribbon
 Science, technology and computing
- Red is the color used for critical or important systems (such as emergency lighting) that operate in low-light or night-time conditions, as rod cells in the human eye do not respond to it and therefore does not interfere in the eye's ability to focus in dim environments.
- 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.
- Oxygenated blood is red due to the presence of oxygenated 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.
|Shades of red|
|Red||Red-violet||Rust||Puce||Sangria||Scarlet||Terra cotta||Vermilion||Amaranth||Rose||Hollywood Cerise||Shocking Pink|
 In fiction
- Red is the last film in the Three Colors trilogy by Krzysztof Kieślowski.
- My Name is Red is one of the books written by the nobel prize winning Turkish author Orhan Pamuk.
 In other languages
In Turkish there are numerous words for red: Al generally refers to the color of blood and related things (blushing, Turkish flag); Kızıl is bright red, and generally refers to fire or rebellion (sunset, communist). Kırmızı is a more general word for red, without strong emotional meaning.
In some decorating and fashion contexts, shades of red are described by reference to the colors of fruits and vegetables that commonly match that shade. These include cherries, beets, turnips, strawberries (often used in referring to "strawberry blonde" hair), and raspberries (as referenced in the Prince song, "Raspberry Beret". While the most popular color for apples is a dark shade of red, the fruit is usually invoked in fashion or decorating to reference a pale yellowish green.
In Welsh a "blue" movie (i.e. pornographic) is called a ffilm goch (a red movie).
 Red pigments
 See also
|Wikimedia Commons has media related to:|
|The Electromagnetic Spectrum|
(Sorted by wavelength, short to long)
|Gamma ray | X-ray | Ultraviolet | Visible spectrum | Infrared | Terahertz radiation | Microwave | Radio waves|
|Visible (optical) spectrum:||Violet | Blue | Green | Yellow | Orange | Red|
|Microwave spectrum:||W band | V band | K band: Ka band, Ku band | X band | C band | S band | L band|
|Radio spectrum:||EHF | SHF | UHF | VHF | HF | MF | LF | VLF | ULF | SLF | ELF|
|Wavelength designations:||Microwave | Shortwave | Mediumwave | Longwave|
 External links
an:Royo ay:Chupika bs:Crvena bg:Червен цвят ca:Roig cs:Červená da:Rød de:Rot arc:ܣܡܘܩܐ el:Κόκκινο es:Rojo eo:Ruĝa eu:Gorri fa:قرمز fr:Rouge gl:Vermello ko:빨강 hr:Crvena id:Merah is:Rauður it:Rosso he:אדום ku:Sor la:Ruber lb:Rout lt:Raudona jbo:xunre mt:Aħmar nah:Chīltic nl:Rood ja:赤 no:Rød nn:Raud nrm:Rouoge ug:قىزىل pl:Barwa czerwona pt:Vermelho ro:Roşu qu:Puka ru:Красный цвет scn:Russu simple:Red sk:Červená sl:Rdeča sr:Црвена боја su:Beureum fi:Punainen sv:Röd ta:சிவப்பு th:สีแดง vi:Đỏ tg:Сурх tr:Kırmızı uk:Червоний колір zh-yue:紅 zh:红色