Image parameter values for high dynamic range television for use in
production and international programme exchange
(2016-2017)
Scope
High Dynamic Range Television (HDR-TV) provides viewers with an enhanced visual experience by
providing images that have been produced to look correct on brighter displays, that provide much brighter
highlights, and that provide improved detail in dark areas. This Recommendation specifies HDR-TV image
parameters for use in production and international programme exchange using the Perceptual Quantization
(PQ) and Hybrid Log-Gamma (HLG) methods.
Keywords
High dynamic range, HDR, television, HDR-TV, image system parameters, television production,
international programme exchange, wide colour gamut, perceptual quantization, PQ, hybrid
log-gamma, HLG
The ITU Radiocommunication Assembly,
considering
a) that digital television image formats for HDTV and UHDTV have been specified by the
ITU-R in Recommendations ITU-R BT.709 and ITU-R BT.2020;
b) that these television image formats have been limited in the image dynamic range they can
provide due to their reliance on legacy cathode ray tube (CRT) characteristics that limit image
brightness and detail in dark areas;
c) that modern displays are capable of reproducing images at a higher luminance, greater
contrast ratio and wider colour gamut than is conventionally employed in programme production;
d) that viewers expect future television viewing to provide improved characteristics compared
with the current HDTV and UHDTV in terms of a more realistic sensation, greater transparency to
the real world and more accurate visual information;
e) that high dynamic range television (HDR-TV) has been shown to increase viewer
enjoyment of television pictures;
f) that HDR-TV provides a “step-change” improvement in viewer experience by means of
substantially increased brightness and detail in highlights and diffuse reflecting objects, while
providing greater detail in dark areas;
g) that the combination of extended dynamic range and extended colour gamut give HDR-TV
a substantially larger colour volume;
h) that the HDR-TV image formats should have, where appropriate, a degree of compatibility
with existing workflows and infrastructure;
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