RGB COLOR SPACES

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

'RGB' is shorthand for 'R'ed, 'G'reen, 'B'lue.
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). Adobe has recently developed another color space called Adobe Wide Gamut RGB, which is even larger, in detriment to gamut density.
As of 2007, 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-grade 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 1931 color space 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

The CIE 1931 color space standard defines both the CIE RGB space, which is an RGB color space with monochromatic primaries, and the CIE XYZ color space, which works like an RGB color space except that it has non-physical primaries that can not be said to be red, green, and blue.

Contents

See also

External links

See also

★ Color space

★ HSV color space

★ HSL color space

★ List of colors

★ Web colors

External links

★ Standard RGB Color Spaces Susstrunk, Buckley and Swen

★ sRGB vs Adobe RGB: The Truth ShootSmarter.com - a summary of the practical aspects of using the two spaces (requires membership - membership free if email provided.)

★ RGB Working Space Information Lindbloom, Bruce