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BT.709

Reference Name: ITU-R BT.709

Definition: ITU-R BT.709-6: Parameter values for the HDTV standards for production and international programme exchange

Responsible Organization: International Telecommunication Union

Contact Information:
ICC Technical Secretary
email: [email protected]

DOCUMENTATION

Documentation source ITU Recommendation BT.709-6 (06/2015)

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

Opto-electronic transfer function:
V = 1.099 L0.45-0.099 V > 0.018
V = 4.5 L V ≤ 0.018
where V is the digital signal and L is the luminance, and both are in the range [0,1].

The electro-optical transfer function (EOTF) is required to be encoded in ICC profiles, in TRC curves and in AToB1,2,3 curves. The EOTF is not defined in ITU-R BT.709, but is specified in ITU-R BT.1886 as follows:

L = V2.4

White point luminance: 100 cd/m2

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

Encoding

Range: linear RGB; see ITU-R BT.709-3 for details of black and nominal peak white quantization levels for 8 and 10-bit encodings

Bit depth: 8 or 10

Image state: Output-referred display

PROFILES

A profile for the Rec. 709-5 Reference Display is here

HINTS FOR PROFILE MAKERS

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