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The RG or red-green color space is a color space
Color space

A color model is an abstract mathematical model describing the way colors can be represented as tuples of numbers, typically as three or four values or color components ....
 that uses only two colors, red
Red

Red is any of a number of similar colors evoked by light consisting predominantly of the longest wavelengths of light discernible by the human eye, in the wavelength range of roughly 625?740 Nanometer....
 and green
Green

Green is a color, the perception of which is evoked by light having a spectrum dominated by energy with a wavelength of roughly 520?570-Nanometre....
. It is an additive
Additive

Additive may refer to:* Additive function, a function which preserves addition* Additive inverse, an arithmetic concept* Additive category, a Preadditive_category with finite Biproduct...
 format, similar to the RGB color model
RGB color model

The RGB color model is an additive color in which red, green, and blue light are added together in various ways to reproduce a broad array of colors....
 but without a blue channel. Thus, blue is said to be out of gamut
Gamut

In color reproduction, including computer graphics and photography, the gamut, or color gamut , is a certain complete subset of colors....
. This format is not in use today, and was only used on two-color Technicolor
Technicolor

Technicolor is the trademark for a series of Color film processes pioneered by Technicolor Motion Picture Corporation , now a division of Thomson SA....
 and other early color processes for films; by comparison to a full spectrum, its poor color reproduction made it undesirable. The system cannot create white naturally, and many colors are distorted.

Any color containing a blue color component can't be replicated accurately in the RG color space.






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Encyclopedia


The RG or red-green color space is a color space
Color space

A color model is an abstract mathematical model describing the way colors can be represented as tuples of numbers, typically as three or four values or color components ....
 that uses only two colors, red
Red

Red is any of a number of similar colors evoked by light consisting predominantly of the longest wavelengths of light discernible by the human eye, in the wavelength range of roughly 625?740 Nanometer....
 and green
Green

Green is a color, the perception of which is evoked by light having a spectrum dominated by energy with a wavelength of roughly 520?570-Nanometre....
. It is an additive
Additive

Additive may refer to:* Additive function, a function which preserves addition* Additive inverse, an arithmetic concept* Additive category, a Preadditive_category with finite Biproduct...
 format, similar to the RGB color model
RGB color model

The RGB color model is an additive color in which red, green, and blue light are added together in various ways to reproduce a broad array of colors....
 but without a blue channel. Thus, blue is said to be out of gamut
Gamut

In color reproduction, including computer graphics and photography, the gamut, or color gamut , is a certain complete subset of colors....
. This format is not in use today, and was only used on two-color Technicolor
Technicolor

Technicolor is the trademark for a series of Color film processes pioneered by Technicolor Motion Picture Corporation , now a division of Thomson SA....
 and other early color processes for films; by comparison to a full spectrum, its poor color reproduction made it undesirable. The system cannot create white naturally, and many colors are distorted.

Any color containing a blue color component can't be replicated accurately in the RG color space. There is a similar color space called RGK which also has a black channel. Outside of a few low-cost high-volume applications, such as packaging and labelling
Packaging and labelling

Packaging is the science, art and technology of enclosing or protecting products for distribution, storage, sale, and use. Packaging also refers to the process of design, evaluation, and production of packages....
, RG and RGK are no longer in use because devices providing larger gamuts such as RGB and CMYK are in widespread use.

Image:Karachi - Pakistan-market.jpg|Original RGB image Image:Karachi - Pakistan-market-RGadd.jpg|Converted to additive RG Image:Karachi - Pakistan-market-RGsub.jpg|Converted to subtractive RG Image:Karachi - Pakistan-market-RC.jpg|Converted to RC (red-cyan)

Color Graphics Adapter (CGA)


The first color capable cards and monitors for IBM PC
IBM PC

The IBM Personal Computer, commonly known as the IBM PC, is the original version and progenitor of the IBM PC compatible hardware platform ....
 family were the Color Graphics Adapter
Color Graphics Adapter

The Color Graphics Adapter , originally also called the Color/Graphics Adapter or IBM Color/Graphics Monitor Adapter, introduced in 1981, was International Business Machines's first color graphics card, and the first color computer display standard for the IBM PC....
 (CGA), which includes two graphic modes: 320×200 pixels with four colors (two bits per pixel
Pixel

In digital imaging, a pixel is the smallest item of information in an image. Pixels are normally arranged in a 2-dimensional grid, and are often represented using dots, squares, or rectangles....
) and 640×200 pixels black-and-white (one bit per pixel). The color mode uses two bits to store red and green 1-bit components (that is, colors in the RG color space) to obtain four combinations: black, red, green and yellow, with two possibilities of intensity: low (darker) and high (lighter). This was known as Fixed palette #2. The Fixed palette #1 adds the blue component, giving black, magenta (red+blue), cyan (green+blue) and white (yellow+blue), with two possible intensities, too.