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Redheads :: Reds :: Redford,_Robert :: Red_Dawn :: Red_Dirt :: Red_Heat :: Redgrave :: Redneck :: Red_River :: Redgrave,_Vanessa
 

Red is any of a number of similar colors at the lowest frequencies of light discernible by the human eye. Red light has a wavelength range of roughly 630-760 nm. Lower frequencies are called infrared, or below red. Red is an additive primary color, complementary to cyan. It was once considered to be a subtractive primary color, and is still sometimes 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). A few examples of the color red are Stop signs, strawberries, apples.

Usage, symbolism, and colloquial expressions


 

This article is licensed under the GNU Free Documentation License. It uses material from the "Red".

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