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BT.2020

Reference Name: ITU-R BT.2020

Definition: ITU-R Recommendation BT.2020 (2015)

Responsible Organization: International Telecommunication Union.

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


DOCUMENTATION

Documentation source ITU-R BT.2020 : Parameter values for ultra-high definition television systems for production and international programme exchange. .

Also see ITU-R BT.2087-0 Colour conversion from Recommendation ITU-R BT.709 to Recommendation ITU-R BT.2020


ENCODING CHARACTERISTICS

Color space

Type: Colorimetric RGB color space

Color gamut: extended (ITU-R BT.2020)

RGB primaries:
    x   y   z
R 0.708 0.292 0.0
G 0.17 0.797 0.033
B 0.131 0.046 0.823

Color component transfer function: C'= C1/2.4
NOTE: The reference electro-optical transfer function for a Rec.2020 display is defined in ITU-R BT.1886. Some implementors use the inverse of the OETF as defined in BT.2020 (BT.2087 case #2) in place of ITU-R BT.1886.

White point luminance: variable
NOTE: The 10-bit signal level that should be measured for the display peak white, "super white" and black are defined in EBU 3325

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

Encoding

Range: linear RGB: 0.0 to 1.0

Bit depth: 10 or 12

Image state: Output-referred

Reference viewing environment

Viewing surround: ratio of luminance of background behind picture monitor to peak luminance of picture: = between 10% ± 2% of reference white value

Ambient illuminance: 10 lux

Background chromaticity: x = 0.3127, y = 0.3290 (D65)
NOTE: background chromaticity is optionally D93 in some regions

Reference medium

White point luminance: unspecified

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

Black point luminance: unspecified

Black point chromaticity: unspecified


PROFILES

A profile for the ITU-R BT.2020 Reference Display is here


Note for profile builders
The diffuse white point of the medium should be mapped to the PCS white point in the profile.

The chromaticities of the primaries for Rec.2020 yield negative tristimulus values when the D65-to-D50 chromatic adaptation matrix is applied. Negative XYZ values are technically not permitted by the v4 ICC specification, but can in practice be used in most CMMs without problems.