RG color space

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The RG color space can produce shades of red, green, and yellow.
The RG color space can produce shades of red, green, and yellow.

The RG or red-green color space is a color space that uses only two colors, red and green. It is an additive format, similar to RGB color space but without a blue channel. Thus, blue is said to be out of gamut. This format is not in use today, and was only used on the earliest 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.

In the RG color space, magenta, which contains a blue component, becomes orange; shades of blue appear muddy brown or black.
In the RG color space, magenta, which contains a blue component, becomes orange; shades of blue appear muddy brown or black.

Any color containing a blue color component can't be replicated accurately in the RG color space. There is also a similar color space called RGK which also has a black channel; it also is no longer in use. Systems providing larger gamuts include RGB, CMYK, and various other colorspaces.

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