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Reference Name: eciRGB (2008)

Definition: ISO 22028-4.2

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:
ECI Chairman
email: Olaf Druemmer


Documentation source see ISO 22028-4.2


Color space

Type: Colorimetric RGB color space

Color gamut: Extended

RGB primaries:
    x   y   z
R 0.67 0.33 0.0
G 0.21 0.71 0.08
B 0.14 0.08 0.78

Color component transfer function: Linear

C'=1.16 C1/3 - 0.16 C ≥ 0.008856
C'=9.033 C C < 0.008856

White point luminance: 160 cd/m2

White point chromaticity: x = 0.3457, y = 0.3585 (D50)

Encoding Range: linear RGB: 0.0 to 1.0

Bit depth per component:

  • integer encoding: 8 or 16 bits
  • floating point encoding: 32 bits if defined by file format, otherwise according to IEEE 754-1985

Image state: Output-referred

Reference viewing environment

Image background (proximal field): 32 cd/m2

Viewing surround: 2.0 cd/m2

Ambient illuminance: 32 lux

Adapted white point luminance: 160 cd/m2

Adapted white point chromaticity: x = 0.3457, y = 0.3585 (D50)

Reference medium

White point luminance: 160 cd/m2

White point chromaticity: x = 0.3457, y = 0.3585 (D50)

Black point luminance: 0.5 cd/m2

Black point chromaticity: x = 0.3457, y = 0.3585 (D50)


A profile for eciRGB (2008) is available from ECI