RGB color space

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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 being built into more medium-range digital cameras, and is favored by many professional graphic artists for its larger gamut.

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,
HDTV (ITU-R BT.709-3) 		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 0.07
NTSC (FCC 1953) CRT Ill. C 0.67 0.33 0.21 0.71 0.14 0.08
NTSC (1979)
(SMPTE C, SMPTE-RP 145)
CRT D65 0.63 0.34 0.31 0.595 0.155 0.07
PAL/SECAM
(EBU 3213, ITU-R BT.470-6) 		CRT D65 0.64 0.33 0.29 0.60 0.15 0.06
CIE (1931) Wide E 0.7347 0.2653 0.2738 0.7174 0.1666 0.0089

Note that CIE 1931 (or CIE XYZ) is not an RGB color space.

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See also

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External links

  • {{cite web 
| author=Susstrunk, Buckley and Swen | url=http://ivrgwww.epfl.ch/publications/sbs99.pdf
| title=Standard RGB Color Spaces | format=PDF | accessdate=November 18 | accessyear=2005 }}
  • {{cite web 
| author=ShootSmarter.com | url=http://www.shootsmarter.com/infocenter/wc025.html
| title=sRGB vs Adobe RGB: The Truth | accessdate=November 18 | accessyear=2005 }} - a summary of the practical aspects of using the two spaces (requires membership - membership free if email provided.)
  • {{cite web 
| author=Lindbloom, Bruce | url=http://www.brucelindbloom.com/index.html?WorkingSpaceInfo.html
| title=RGB Working Space Information | accessdate=November 18 | accessyear=2005 }}de:RGB-Farbraum

nl:Afgesproken RGB-waarde

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