![RGB illumination](https://upload.wikimedia.org/wikipedia/commons/2/28/RGB_illumination.jpg)
Additive color or additive mixing is a property of a color model that predicts the appearance of
color
Color (American English) or colour (British English) is the visual perceptual property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physical specifications of color are assoc ...
s made by coincident component
light
Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 te ...
s, i.e. the perceived color can be predicted by summing the numeric representations of the component colors. Modern formulations of
Grassmann's laws describe the additivity in the color perception of light mixtures in terms of algebraic equations. Additive color predicts perception and not any sort of change in the photons of light themselves. These predictions are only applicable in the limited scope of color matching experiments where viewers match small patches of uniform color isolated against a grey or black background.
Additive color models are applied in the design and testing of electronic displays that are used to render realistic images containing diverse sets of color using
phosphors that emit light of a limited set of
primary color
A set of primary colors or primary colours (see spelling differences) consists of colorants or colored lights that can be mixed in varying amounts to produce a gamut of colors. This is the essential method used to create the perception of a ...
s. Examination with a sufficiently powerful magnifying lens will reveal that each pixel in
CRT,
LCD, and most other types of color video displays is composed of red, green, and blue light-emitting phosphors which appear as a variety of single colors when viewed from a normal distance.
Additive color, alone, does not predict the appearance of mixtures of printed color inks, dye layers in color
photographs on
film, or paint mixtures. Instead,
subtractive color
Subtractive color or subtractive color mixing predicts the spectral power distribution of light after it passes through successive layers of partially absorbing media. This idealized model is the essential principle of how dyes and inks are use ...
is used to model the appearance of
pigment
A pigment is a colored material that is completely or nearly insoluble in water. In contrast, dyes are typically soluble, at least at some stage in their use. Generally dyes are often organic compounds whereas pigments are often inorganic compou ...
s or
dyes, such as those in
paints,
inks
Ink is a gel, sol, or solution that contains at least one colorant, such as a dye or pigment, and is used to color a surface to produce an image, text, or design. Ink is used for drawing or writing with a pen, brush, reed pen, or quill. Thicke ...
.
The combination of two of the common three additive
primary color
A set of primary colors or primary colours (see spelling differences) consists of colorants or colored lights that can be mixed in varying amounts to produce a gamut of colors. This is the essential method used to create the perception of a ...
s in equal proportions produces an additive
secondary color
A secondary color is a color made by mixing of two primary colors in a given color space.
Additive secondaries
Light (RGB)
For the human eye, good primary colors of light are red, green, and blue. Combining lights of these colors produces ...
—
cyan,
magenta
Magenta () is a color that is variously defined as pinkish- purplish- red, reddish-purplish-pink or mauvish-crimson. On color wheels of the RGB (additive) and CMY (subtractive) color models, it is located exactly midway between red and blu ...
or
yellow
Yellow is the color between green and orange on the spectrum of light. It is evoked by light with a dominant wavelength of roughly 575585 nm. It is a primary color in subtractive color systems, used in painting or color printing. In the ...
. Additive color is also used to predict colors from overlapping projected colored lights often used in theatrical lighting for plays, concerts, circus shows, and night clubs.
The full
gamut
In color reproduction, including computer graphics and photography, the gamut, or color gamut , is a certain ''complete subset'' of colors. The most common usage refers to the subset of colors which can be accurately represented in a given circ ...
of color available in any additive color system is defined by all the possible combinations of all the possible
luminosities of each primary color in that system. In
chromaticity
Chromaticity is an objective specification of the quality of a color regardless of its luminance. Chromaticity consists of two independent parameters, often specified as hue (h) and colorfulness (s), where the latter is alternatively called ...
space, a gamut is a plane
convex polygon
In geometry, a convex polygon is a polygon that is the boundary of a convex set. This means that the line segment between two points of the polygon is contained in the union of the interior and the boundary of the polygon. In particular, it is a ...
with corners at the primaries. For three primaries, it is a
triangle
A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices ''A'', ''B'', and ''C'' is denoted \triangle ABC.
In Euclidean geometry, any three points, when non- colline ...
.
History
![Tartan Ribbon](https://upload.wikimedia.org/wikipedia/commons/7/7f/Tartan_Ribbon.jpg)
Systems of additive color are motivated by the
Young–Helmholtz theory
The Young–Helmholtz theory (based on the work of Thomas Young and Hermann von Helmholtz in the 19th century), also known as the trichromatic theory, is a theory of trichromatic color vision – the manner in which the visual system gives rise ...
of
trichromatic color vision
Trichromacy or trichromatism is the possessing of three independent channels for conveying color information, derived from the three different types of cone cells in the eye. Organisms with trichromacy are called trichromats.
The normal expla ...
, which was articulated around 1850 by
Hermann von Helmholtz
Hermann Ludwig Ferdinand von Helmholtz (31 August 1821 – 8 September 1894) was a German physicist and physician who made significant contributions in several scientific fields, particularly hydrodynamic stability. The Helmholtz Associatio ...
, based on earlier work by
Thomas Young. For his experimental work on the subject,
James Clerk Maxwell
James Clerk Maxwell (13 June 1831 – 5 November 1879) was a Scottish mathematician and scientist responsible for the classical theory of electromagnetic radiation, which was the first theory to describe electricity, magnetism and li ...
is sometimes credited as being the father of additive color. He had the photographer
Thomas Sutton
Thomas Sutton (1532 – 12 December 1611) was an English civil servant and businessman, born in Knaith, Lincolnshire. He is remembered as the founder of the London Charterhouse and of Charterhouse School.
Life
Sutton was the son of an official ...
photograph a tartan ribbon on black-and-white film three times, first with a red, then green, then blue color filter over the lens. The three black-and-white images were developed and then projected onto a screen with three different projectors, each equipped with the corresponding red, green, or blue color filter used to take its image. When brought into alignment, the three images (a black-and-red image, a black-and-green image and a black-and-blue image) formed a full-color image, thus demonstrating the principles of additive color.
See also
*
Color mixing
There are three types of color mixing: ''additive'', ''subtractive'', and ''average''. In first two cases, mixing is typically described in terms of three primary colors and three secondary colors (colors made by mixing two of the three primary ...
*
Color space
A color space is a specific organization of colors. In combination with color profiling supported by various physical devices, it supports reproducible representations of colorwhether such representation entails an analog or a digital represen ...
*
Color theory
*
Color motion picture film
Color motion picture film refers both to unexposed color photographic film in a format suitable for use in a motion picture camera, and to finished motion picture film, ready for use in a projector, which bears images in color.
The first colo ...
*
Kinemacolor
Kinemacolor was the first successful colour motion picture process, used commercially from 1908 to 1914. It was invented by George Albert Smith in 1906. He was influenced by the work of William Norman Lascelles Davidson and, more directly, E ...
*
Prizma Color
*
RGB color model
*
Subtractive color
Subtractive color or subtractive color mixing predicts the spectral power distribution of light after it passes through successive layers of partially absorbing media. This idealized model is the essential principle of how dyes and inks are use ...
*
Technicolor
Technicolor is a series of Color motion picture film, color motion picture processes, the first version dating back to 1916, and followed by improved versions over several decades.
Definitive Technicolor movies using three black and white films ...
*
William Friese-Greene
William Friese-Greene (born William Edward Green, 7 September 1855 – 5 May 1921) was a prolific English inventor and professional photographer. He was known as a pioneer in the field of motion pictures, having devised a series of cameras in 1 ...
References
External links
RGB and CMYK Colour systems.- Photos and stories from the James Clerk Maxwell Foundation.
* Stanford University CS 17
comparing additive and subtractive color mixing.
{{DEFAULTSORT:Additive Color
Color space
Color