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sRGB

Reference Name: sRGB

Definition: IEC 61966-2-1:1999

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 sRGB.pdf.


ENCODING CHARACTERISTICS

Color space

Type: Colorimetric RGB color space

Color gamut: CRT-based (ITU-R BT.709-3)

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'=12.92 C 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: 0.0 to 1.0

Bit depth: 8 (others allowed)

Image state: Output-referred (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)


PROFILES

Both ICC v2 and v4 profiles are available here


HINTS FOR PROFILE MAKERS

ICC extensions: Equations defining transform to ICC PCS in srgb.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.