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Digital Transformation Series
ITU has unveiled a new standard for High Dynamic Range Television (HDR-TV), the ITU-R Recommendation BT.2100, which represents a major advancement in television broadcasting.
ITU’s Radiocommunication Sector (ITU-R) has developed the standard in collaboration with experts from the television industry, broadcasting organisations and regulatory institutions in its Study Group 6.
“High Dynamic Range Television will bring a whole new viewing experience to audiences around the world,” Houlin Zhao, ITU Secretary-General says, while welcoming the announcement. “TV programming will be enhanced with brighter pictures that add sparkle to entertainment and realism to news coverage.”
Also commenting on the announcement, François Rancy, Director of the ITU Radiocommunication Bureau adds that “High Dynamic Range Television represents an important step towards the virtual-reality quality of experience to be delivered by future broadcasting and multimedia systems.”
He congratulated Yukihiro Nishida, Chairman of ITU-R Study Group 6, for this major achievement.
Andy Quested, Chairman of ITU-R Working Party 6C (WP 6C), which developed the new standard said: “This Recommendation is the culmination of three years of intensive work by dedicated image experts from around the world. HDR images are stunning and this is another major step forward in television quality.”
Quested says that “programme makers today need a much wider range of options in order to meet the expectations of the different platforms they must supply, and this need for flexibility is catered for within the framework of a stable ITU-R Recommendation.”
This latest ITU-R UHDTV Recommendation BT. 2100, which brings a further boost to television images, giving viewers an enhanced visual experience with added realism, replaces the ITU-R UHDTV Recommendation BT. 2020, approved in October 2015, representing the continuous evolution of television since it was invented in the 1930s.
The HDR-TV Recommendation allows TV programmes to take full advantage of the new and much brighter display technologies. HDR-TV can make outdoor sunlit scenes appear brighter and more natural, adding highlights and sparkles.
It also enhances dimly lit interior and night scenes, revealing more detail in darker areas, giving TV producers the ability to reveal texture and subtle colours that are usually lost with existing Standard Dynamic Range TV.
The HDR-TV Recommendation details two options for producing High Dynamic Range TV images:
- The Perceptual Quantization (PQ) specification achieves a very wide range of brightness levels using a transfer function that is finely tuned to match the human visual system.
- The Hybrid Log-Gamma (HLG) specification which offers a degree of compatibility with legacy displays by more closely matching the previously established television transfer curves.
The Recommendation also outlines a simple conversion process between the two HDR-TV options.
The ITU-R Recommendation BT.2100 also allows TV producers to choose from three levels of detail or resolution: HDTV (1920 by 1080), and UHDTV ‘4K’ (3840 by 2160) and ‘8K’ (7680 by 4320) – all of which use the progressive imaging system with extended colour gamut and range of frame-rates in ITU’s UHDTV Recommendation BT.2020.
