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: technicalsecretary@color.org

DOCUMENTATION

Documentation source see Amendment 1 to IEC 61966-2-1:1999.

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 C^1/2.4-0.055

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: 0.2 cd/m²

Black point chromaticity: unspecified

PROFILES

Both ICC v2 and v4 profiles are available on the sRGB Profiles page.

HINTS FOR PROFILE MAKERS

ICC extensions: Equations defining transform to ICC PCS in sRGB.pdf (Updated April 2015)

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