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: technicalsecretary@color.org

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 L^0.45-0.099 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 = V^2.4

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

PROFILE

ITU-RBT709ReferenceDisplay.icc

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.