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RGB color space

From Academic Kids

An RGB color space is any additive color space based on the RGB color model.

RGB is shorthand for Red, Green, Blue.

RGB is a convenient color model for computer graphics because the human visual system works in a way that is similar - though not quite identical - to an RGB color space. The most commonly used RGB color spaces are sRGB and Adobe RGB, which has a significantly larger gamut than sRGB. Adobe has recently developed another color space called Adobe Wide Gamut RGB, which is even larger, in detriment of gamut density.

As of 2004, sRGB is by far the most commonly used RGB color space, particularly in consumer grade digital cameras, because it is considered adequate for most consumer applications, and its design simplifies previewing on the typical computer display. Adobe RGB is also being built into more medium-range digital cameras, and is favored by many professional graphic artists.

RGB spaces are generally specified by defining three primary colors and a white point. In the table below the three primary colors and white points for various RGB spaces are given. The primary colors are specified in terms of their CIE chromaticity coordinates (x,y).

Some RGB color space parameters (from Susstrunk, Buckley and Swen 2005)
Color Space Gamut White Point Primaries
xR yR xG yG xB yB
ISO RGB Limited floating floating
Extended ISO RGB Unlimited (signed) floating floating
sRGB CRT D65 0.64 0.33 0.30 0.60 0.15 0.06
ROMM RGB Wide D50 0.7347 0.2653 0.1596 0.8404 0.0366 0.0001
Adobe RGB 98 CRT D65 0.64 0.34 0.21 0.71 0.15 0.06
Apple RGB CRT D65 0.625 0.34 0.28 0.595 0.155 0.070
NTSC RGB CRT Ill. C 0.67 0.33 0.21 0.71 0.14 0.08
EBU RGB (CCIR 601) CRT D65 0.64 0.33 0.29 0.60 0.15 0.06
ITU-R BT.709 CRT D65 0.64 0.33 0.30 0.60 0.15 0.06
CIE RGB (1931) Wide E 0.7347 0.2653 0.2738 0.7174 0.1666 0.0089

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