REC. 2020 (OETF)
The Rec. 2020 (OETF) color space is not registered in Color by default
Properties
Name: rec2020-oetf
White Point: D65 / 2˚
Coordinates:
| Name | Range* |
|---|---|
r |
[0, 1] |
g |
[0, 1] |
b |
[0, 1] |
* Range denotes in gamut colors, but the color space supports an extended range beyond the gamut.
Figure 1. CIE 1931 xy Chromaticity – Rec. 2020 Chromaticities
ITU-R Recommendation BT.2020, more commonly known by the abbreviations Rec. 2020 or BT.2020, defines various aspects of ultra-high-definition television (UHDTV) with standard dynamic range (SDR) and wide color gamut (WCG), including picture resolutions, frame rates with progressive scan, bit depths, color primaries, RGB and luma-chroma color representations, chroma subsamplings, and an opto-electronic transfer function. The color is used in 4k and 8k UHDTV.
This is a scene-referred variant that uses the OETF specified in the BT.2020 spec.
Channel Aliases
| Channels | Aliases |
|---|---|
r |
red |
g |
green |
b |
blue |
Input/Output
Rec. 709 is not supported via the CSS spec and the parser input and string output only supports the
color() function format using the custom name --rec2020-oetf:
color(--rec2020-oetf r g b / a) // Color function
When manually creating a color via raw data or specifying a color space as a parameter in a function, the color space name is always used:
Color("--rec2020-oetf", [0, 0, 0], 1)
The string representation of the color object and the default string output will be in the
color(rec2020 r g b / a) form.
>>> Color("rec2020-oetf", [0.79198, 0.23098, 0.07376])
color(--rec2020-oetf 0.79198 0.23098 0.07376 / 1)
>>> Color("rec2020-oetf", [0.86727, 0.64078, 0.18496]).to_string()
'color(--rec2020-oetf 0.86727 0.64078 0.18496)'
Registering
from coloraide import Color as Base
from coloraide.spaces.rec2020_oetf import Rec2020OETF
class Color(Base): ...
Color.register(Rec2020OETF())