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bg-sRGB

Reference Name: bg-sRGB

Definition: Amendment 1 to IEC 61966-2-1:1999 (similar to e-sRB in PIMA 7667:2001)

Responsible Organization: International Standard defining this colour encoding published by IEC, Geneva (document available through National Standards Bodies). Characterisation data derived from this was defined by ICC.

Contact Information:
ICC Technical Secretary
email: askphil@colourspace.demon.co.uk


DOCUMENTATION

Documentation source see Amendment 1 to IEC 61966-2-1:1999 and bg-sRGB.pdf.


ENCODING CHARACTERISTICS

Color space

Type: Colorimetric RGB color space

Color gamut: Extended

RGB primaries:
    x   y   z
R 0.64 0.33 0.03
G 0.30 0.60 0.10
B 0.15 0.06 0.79

Color component transfer function:
C'=-1.055 (-C)1/2.4 + 0.055 C < -0.0031308
C'=12.92 C -0.0031308 ≤ C ≤ 0.0031308
C'=1.055 C1/2.4-0.055 C > 0.0031308

White point luminance: 80 cd/m2

White point chromaticity: x = 0.3127, y = 0.3290 (D65)

Encoding Range: linear RGB: -0.53 to 1.68

Bit depth: 10, 12, 16

Image state: Output-referred (hypothetical extended-gamut CRT)

Reference viewing environment

Image background (proximal field): 16 cd/m2

Viewing surround: 4.1 cd/m2

Ambient illuminance: 64 lux

Adapted white point luminance: Unspecified

Adapted white point chromaticity: Unspecified

Reference medium

White point luminance: 80 cd/m2

White point chromaticity: x = 0.3127, y = 0.3290 (D65)

Black point luminance: 1 cd/m2

Black point chromaticity: x = 0.3127, y = 0.3290 (D65)


HINTS FOR PROFILE MAKERS

ICC extensions: Equations defining transform to ICC PCS in bgsRGB.pdf

Also see Transforming via the ICC PCS for details on the derivation and use of D50 adapted data, chromatic adaptation matrix and measurement corrections.