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 Technicolor films; its poor color reproduction made it undesirable. The system cannot create white, 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.
Any color containing a blue color component can't be replicated accurately in the RG color space. A few years later, Technicolor created a 3-color system, which is now RGB. There is also a similar color space called RGK which also has a key channel; it also is no longer in use. Systems providing larger gamuts include RGB, CMYK, and various other colorspaces.
These three colors should not be confused with the primary pigments of red, blue and yellow, known in the art world as "primary colors".
Primary colors are more related to biological rather than to physical concepts, because they refer to the physiological response of the cells of the human retina to light.
One common application of the RGBcolor model is the display of colors on a cathode ray tube, liquid crystal display or plasma display, such as a television or a computer's monitor.
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