SECONDARY COLORS:-

SECONDARY COLORS:-

A secondary colour is a color made by mixing of two primary colours in a given colour space.

secondary color.

The basic colors of pigments: primary cyan, magenta, and yellow, blended to form secondary red, green, and blue.

Additive secondaries:-

ADDITIVE COLOR:-

Additive color or additive mixing is a property of a color model that predicts the appearance of colors made by coincident component lights, 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.

Red, green, and blue lights combining by reflecting from a white wall: adding red to green yields yellow; adding all three primary colors together yields white.

james clerk Maxwell.

(James Clerk Maxwell, with his color top that he used for investigation of color vision and additive color).

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 colors. 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 is used to model the appearance of pigments or dyes, such as those in paints, inks.

The combination of two of the common three additive primary colors in equal proportions produces an additive secondary color—cyan, magenta or yellow.

 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 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 space, a gamut is a plane convex polygon with corners at the primaries. For three primaries, it is a triangle.

HISTORY:-

history of the additive color.

The first permanent color photograph, taken by Thomas Sutton, under the direction of James Clerk Maxwell in 1861.

Systems of additive color are motivated by the Young–Helmholtz theory of trichromatic color vision, which was articulated around 1850 by Hermann von Helmholtz, based on earlier work by Thomas Young. For his experimental work on the subject, James Clerk Maxwell is sometimes credited as being the father of additive color. He had the photographer Thomas Sutton 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.

RGB color :-

"RGB" redirects here. For other uses, see RGB (disambiguation). Not to be confused with RBG.

The RGB color model is an additive color model, 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.

The RGB Color.

(Full color image along with its R, G, and B components.)

additive color with RGB.

(A diagram demonstrating additive color with rgb)

The main purpose of the RGB color model is for the sensing, representation, and display of images in electronic systems, such as televisions and computers, though it has also been used in conventional photography. Before the electronic age, the RGB color model already had a solid theory behind it, based in human perception of colors.

RGB is a device-dependent color model: different devices detect or reproduce a given RGB value differently, since the color elements (such as phosphors or dyes) and their response to the individual red, green, and blue levels vary from manufacturer to manufacturer, or even in the same device over time. Thus an RGB value does not define the same color across devices without some kind of color management.

Typical RGB input devices are color TV and video cameras, image scanners, and digital cameras. Typical RGB output devices are TV sets of various technologies (CRT, LCD, plasma, OLED, quantum dots, etc.), computer and mobile phone displays, video projectors, multicolor LED displays and large screens such as the Jumbotron. Color printers, on the other hand, are not RGB devices, but subtractive color devices typically using the CMYK color model.

RGB color model:-

For the human eye, good primary colors of light are red, green, and blue. Combining lights of these colors produces a large range of visible colors.

red (●) + green (●) = yellow (●)

green (●) + blue (●) = cyan (●)

blue (●) + red (●) = magenta (●)

That is, the primary and secondary RGB colors (with secondary colors in boldface) are:-

Red, yellow, green, cyan, blue,.magenta. red.

 Combining RGB colors means adding light (thus the term "additive color"), and the combinations are brighter. When all three primaries are combined in equal amounts, the result is white.

The RGB secondary colors produced by the addition of light turn out to be good primary colors for pigments, the mixing of which subtracts light.

Subtractive color:-

Pigments, such as inks and paint, display color by absorbing some wavelengths of light and reflecting the remainder. When pigments are combined, they absorb the combination of their colors, and reflect less. Thus, combining pigments results in a darker color. This is called subtractive color-mixing, as mixing pigments subtracts wavelengths from the light that is reflected.

CMYK color model:-

The mixture of equal amounts of these colors produce the secondary colors red, blue, and "lime" green (the RGB primary colors of light), as follows:

cyan (●) + magenta (●) = blue (●)

magenta (●) + yellow (●) = red (●)

yellow (●) + cyan (●) = green (●)

That is, the primary and secondary CMY colors (with secondary colors in boldface) are:-

cyan, blue, magenta red, yellow, green, cyan.

Ideally, combining three perfect primary colors in equal amounts would produce black, but this is impossible to achieve in practice. Therefore a "key" pigment, usually black, is added to printing to produce dark shades more efficiently. This combination is referred to as CMYK, where K stands for Key.

Traditional painting (RYB) RYB color model:-

Before the discovery of CMY, at least as far back as Goethe, the best primary colors were thought to be red, yellow, and blue. Mixing these pigments in equal amounts produces orange, green, and purple:

red (●) + yellow (●) = orange (●)

yellow (●) + blue (●) = green (●)

blue (●) + red (●) = purple (●)

That is, the primary and secondary RYB colors (with secondary colors in boldface) are:-

red, orange, yellow, green, blue, purple, red.

 

Ref:-https://en.m.wikipedia.org