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
xR yR xG yG xB yB
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