RGB Color Space - Specifications

Specifications

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**
Color Space	Gamut	White Point	Primaries
Color Space	Gamut	White Point	x_R	y_R	x_G	y_G	x_B	y_B
ISO RGB	Limited	floating	floating
Extended ISO RGB	Unlimited (signed)	floating	floating
HDTV (ITU-R BT.709), sRGB	CRT	D65	0.64	0.33	0.30	0.60	0.15	0.06
scRGB	Unlimited (signed)	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	0.33	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 (1953) (FCC 1953, ITU-R BT.470 System M)	CRT	C	0.67	0.33	0.21	0.71	0.14	0.08
NTSC (1987) (SMPTE RP 145 "SMPTE C", SMPTE 170M)	CRT	D65	0.63	0.34	0.31	0.595	0.155	0.07
PAL/SECAM (1970) (EBU Tech. 3213, ITU-R BT.470 System B, G)	CRT	D65	0.64	0.33	0.29	0.60	0.15	0.06
Adobe Wide Gamut RGB	Wide	D50	0.735	0.265	0.115	0.826	0.157	0.018
UHDTV (ITU-R BT.2020)	Wide	D65	0.708	0.292	0.170	0.797	0.131	0.046
CIE (1931)	Wide	E	0.7347	0.2653	0.2738	0.7174	0.1666	0.0089
CIE XYZ (not RGB)	Unlimited	E	0	1	1	0	0	0

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 cannot be said to be red, green, and blue.

Read more about this topic: RGB Color Space