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Red (RGB), RGB red, or electric red[citation needed] (as opposed to pigment red, shown below) is the brightest possible red that can be reproduced on a computer monitor. This color is an approximation of an orangish red spectral color. It is one of the three primary colors of light in the RGB color model, along with green and blue.
A diagram demonstrating additive color with RGB. The RGB color model is an additive color model [1] in which the red, green and blue primary colors of light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green, and blue.
Red is the color at the long wavelength end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625–740 nanometres. [1] It is a primary color in the RGB color model and a secondary color (made from magenta and yellow) in the CMYK color model, and is the complementary color of cyan.
In some uses, hexadecimal color codes are specified with notation using a leading number sign (#). A color is specified according to the intensity of its red, green and blue components, each represented by eight bits. Thus, there are 24 bits used to specify a web color within the sRGB gamut, and 16,777,216 colors that may be so specified.
The first letter of the color code is matched by order of increasing magnitude. The electronic color codes, in order, are: 0 = Black; 1 = Brown; 2 = Red; 3 = Orange; 4 = Yellow; 5 = Green; 6 = Blue; 7 = Violet; 8 = Gray; 9 = White. Easy to remember. A mnemonic which includes color name(s) generally reduces the chances of confusing black and brown.
The IALA recommends categorical color codes in 7 colors: red, orange, yellow, green, blue, white & black. Adding redundant coding of luminosity and colorfulness adds information and increases speed and accuracy of color decoding tasks. Color codes are superior to others (encoding to letters, shape, size, etc.) in certain types of tasks.
ISCC–NBS descriptor. Dark purplish red. B: Normalized to [0–255] (byte) Displayed at right is deep tone of ruby that is called ruby in the British Standards 381 color list. This color is #542 on the 381 color list. The 381 color list is for colors used in identification, coding, and other special purposes.
A native of Central America collecting cochineal insects from a cactus to make red dye (1777). Rembrandt used carmine lake, made of cochineal, to paint the skirt of the bride in the painting known as "The Jewish bride" (1665–1669). Scarlet was the traditional color of the British nobility in the 17th and 18th century.