HOME

TheInfoList



OR:

The hybrid log–gamma (HLG) transfer function is a
transfer function In engineering, a transfer function (also known as system function or network function) of a system, sub-system, or component is a function (mathematics), mathematical function that mathematical model, models the system's output for each possible ...
jointly developed by the
BBC The British Broadcasting Corporation (BBC) is a British public service broadcaster headquartered at Broadcasting House in London, England. Originally established in 1922 as the British Broadcasting Company, it evolved into its current sta ...
and
NHK , also known by its Romanization of Japanese, romanized initialism NHK, is a Japanese public broadcasting, public broadcaster. It is a statutory corporation funded by viewers' payments of a television licence, television license fee. NHK ope ...
for
high dynamic range High dynamic range (HDR), also known as wide dynamic range, extended dynamic range, or expanded dynamic range, is a signal with a higher dynamic range than usual. The term is often used in discussing the dynamic ranges of images, videos, audio o ...
(HDR) display. It is backward compatible with the transfer function of SDR (the gamma curve). It was approved as ARIB STD-B67 by the
Association of Radio Industries and Businesses The , commonly known as , is a standardization organization in Japan. ARIB is designated as the center for promotion of the efficient use of the radio spectrum and the designated frequency change support agency. Its activities include those previo ...
(ARIB). It is also defined in ATSC 3.0,
Digital Video Broadcasting Digital Video Broadcasting (DVB) is a set of international open standards for digital television. DVB standards are maintained by the DVB Project, an international industry consortium, and are published by a Joint Technical Committee (JTC) o ...
(DVB) UHD-1 Phase 2, and
International Telecommunication Union The International Telecommunication Union (ITU)In the other common languages of the ITU: * * is a list of specialized agencies of the United Nations, specialized agency of the United Nations responsible for many matters related to information ...
(ITU) Rec. 2100. HLG is an HDR format that uses the HLG transfer function, BT.2020 color primaries and a bitdepth of 10-bit. HLG was designed to be
backward compatible In telecommunications and computing, backward compatibility (or backwards compatibility) is a property of an operating system, software, real-world product, or technology that allows for interoperability with an older legacy system, or with inpu ...
with SDR UHDTV. However, HLG is not intended to be fully backward compatible with traditional SDR displays that cannot interpret BT.2020 colorimetry. Both HLG transfer function and the HLG format are
royalty-free Royalty-free (RF) material subject to copyright or other intellectual property rights may be used without the need to pay royalties or license fees for each use, per each copy or volume sold or some time period of use or sales. Computer standards ...
. The backward compatibility allows them to be used with existing transmission standards when the receiver is compatible with the BT.2020 colour container, reducing complexity and cost for both equipment manufacturers and content distributors. They are supported by
HDMI High-Definition Multimedia Interface (HDMI) is a proprietary digital interface used to transmit high-quality video and audio signals between devices. It is commonly used to connect devices such as televisions, computer monitors, projectors, gam ...
2.0b,
HEVC High Efficiency Video Coding (HEVC), also known as H.265 and MPEG-H Part 2, is a video compression standard designed as part of the MPEG-H project as a successor to the widely used Advanced Video Coding (AVC, H.264, or MPEG-4 Part 10). In co ...
, VP9, and H.264/MPEG-4 AVC, and are used by video services such as
BBC iPlayer BBC iPlayer (stylised as iPLAYER or BBC iPLAYER) is a video on demand service from the BBC. The service is available Over-the-top media service, over-the-top on a wide range of devices, including Mobile phone, mobile phones and Tablet computer ...
,
DirecTV DirecTV, LLC is an American Multichannel television in the United States, multichannel video programming distributor based in El Segundo, California. Originally launched on June 17, 1994, its primary service is a digital Satellite television, s ...
, Freeview Play, and
YouTube YouTube is an American social media and online video sharing platform owned by Google. YouTube was founded on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim who were three former employees of PayPal. Headquartered in ...
.


Description

HLG is designed to be better-suited for
television broadcasting A television broadcaster or television network is a telecommunications network for the distribution of television content, where a central operation provides programming to many television stations, pay television providers or, in the United ...
, where the metadata required for other HDR formats is not
backward compatible In telecommunications and computing, backward compatibility (or backwards compatibility) is a property of an operating system, software, real-world product, or technology that allows for interoperability with an older legacy system, or with inpu ...
with non-HDR displays, consumes additional
bandwidth Bandwidth commonly refers to: * Bandwidth (signal processing) or ''analog bandwidth'', ''frequency bandwidth'', or ''radio bandwidth'', a measure of the width of a frequency range * Bandwidth (computing), the rate of data transfer, bit rate or thr ...
, and may also become out-of-sync or damaged in transmission. HLG defines a non-linear optical-electro transfer function, in which the lower half of the signal values use a gamma curve and the upper half of the signal values use a
logarithmic curve In mathematics, logarithmic growth describes a phenomenon whose size or cost can be described as a logarithm function of some input. e.g. ''y'' = ''C'' log (''x''). Any logarithm base can be used, since one can be converted to anot ...
. In practice, the signal is interpreted as normal by standard-dynamic-range displays (albeit capable of displaying more detail in highlights), but HLG-compatible displays can correctly interpret the logarithmic portion of the signal curve to provide a wider dynamic range. In contrast with the other HDR formats it does not use metadata. The HLG
transfer function In engineering, a transfer function (also known as system function or network function) of a system, sub-system, or component is a function (mathematics), mathematical function that mathematical model, models the system's output for each possible ...
is backward compatible with SDR's gamma curve. However, HLG is commonly used with Rec. 2020 color primaries which produce a de- saturated image with visible hue shifts on non-compatible devices. HLG is therefore backward compatible with SDR- UHDTV and will show color distortion on common SDR devices that only support Rec. 709 color primaries.


Technical details

HLG defines a
nonlinear In mathematics and science, a nonlinear system (or a non-linear system) is a system in which the change of the output is not proportional to the change of the input. Nonlinear problems are of interest to engineers, biologists, physicists, mathe ...
transfer function In engineering, a transfer function (also known as system function or network function) of a system, sub-system, or component is a function (mathematics), mathematical function that mathematical model, models the system's output for each possible ...
in which the lower half of the signal values use a gamma curve and the upper half of the signal values use a
logarithmic curve In mathematics, logarithmic growth describes a phenomenon whose size or cost can be described as a logarithm function of some input. e.g. ''y'' = ''C'' log (''x''). Any logarithm base can be used, since one can be converted to anot ...
. HLG reference OETF is as follows (as defined in ARIB STD-B67): E'=\begin r \, \sqrt\ & 0 \le E \le 1,\!\\ a \ln(E - b) + c & 1 < E \end or as follows (as defined in Rec. 2100): E'=\begin \sqrt\ & 0 \le E \le \frac ,\!\\ a \ln(12E - b) + c & \frac < E \le 1 \end where *''E'' is the linear light signal normalized by the reference white level in the range \left , 12 \right/math> in ARIB STD-B67 and in the range \left , 1 \right/math> in Rec. 2100. *''E' '' is the resulting
nonlinear In mathematics and science, a nonlinear system (or a non-linear system) is a system in which the change of the output is not proportional to the change of the input. Nonlinear problems are of interest to engineers, biologists, physicists, mathe ...
signal *''r'' is the reference white level and has a signal value of 0.5 * and the constants ''a'', ''b'', and ''c'' are defined as ''a'' = 0.17883277, ''b'' = 1 - 4''a'' = 0.28466892, and ''c'' = 0.5 - ''a'' ln(4''a'') = 0.55991073 The signal value is 0.5 for the reference white level while the signal value for 1 has a
relative luminance Relative luminance Y follows the Luminance, photometric definition of luminance L including spectral weighting for human vision, but while luminance L is a measure of light in units such as cd/m^2, relative luminance Y values are normalized as ...
that is 12 times higher than the reference white level. ARIB STD-B67 has a nominal range of 0 to 12. HLG uses a logarithmic curve for the upper half of the signal values due to Weber's law. HLG reference OOTF is as follows: \begin F_D = OOTF \alpha Y_S^ E \!\\ R_D = \alpha Y_S^ R_S \!\\ G_D = \alpha Y_S^ G_S \!\\ B_D = \alpha Y_S^ B_S \!\\ Y_S = 0.2627 R_S + 0.6780 G_S + 0.0593 B_S \end where * F_D is the luminance of a displayed linear component R_D, G_D, B_D in cd/m2. * E is a signal for each colour component proportional to scene linear light normalized to the range \left , 1 \right/math>. * Y_S is the normalized linear scene luminance. * \alpha is the variable for user gain in cd/m2. It represents LW, the nominal peak luminance of a display for achromatic pixels. * \gamma is the system gamma. \gamma = 1.2 at the nominal display peak luminance of 1000 cd/m2. HLG reference EOTF is as follows: F_D = OOTF ETF^[max(0,(1-\beta)E' + \beta ) where * F_D is the luminance of a displayed linear component R_D, G_D, B_D in cd/m2. * E' is the non-linear electrical signal R', G', B' in the range \left , 1 \right/math>. * \beta = \sqrt is the variable for user black level lift. * L_W is nominal peak luminance of the display in cd/m2 for achromatic pixels. * L_B is the display luminance for black in cd/m2. HLG does not need to use metadata since it is compatible with both SDR displays and High-dynamic-range video, HDR displays. HLG can be used with displays of different
brightness Brightness is an attribute of visual perception in which a source appears to be radiating/reflecting light. In other words, brightness is the perception dictated by the luminance of a visual target. The perception is not linear to luminance, and ...
in a wide range of viewing environments. The
dynamic range Dynamics (from Greek δυναμικός ''dynamikos'' "powerful", from δύναμις ''dynamis'' " power") or dynamic may refer to: Physics and engineering * Dynamics (mechanics), the study of forces and their effect on motion Brands and ent ...
that can be perceived by the
human eye The human eye is a sensory organ in the visual system that reacts to light, visible light allowing eyesight. Other functions include maintaining the circadian rhythm, and Balance (ability), keeping balance. The eye can be considered as a living ...
in a single image is around 14 stops. An SDR video display with a 2.4 gamma curve and a bit depth of 8-bits per sample can display a range of about 6 stops without visible banding. Professional SDR video displays with a bit depth of 10-bits per sample extend that range to about 10 stops. When HLG is displayed on a 2,000 cd/m2 display with a bit depth of 10-bits per sample it can display a range of 200,000:1 or 17.6 stops without visible banding. HLG increases the
dynamic range Dynamics (from Greek δυναμικός ''dynamikos'' "powerful", from δύναμις ''dynamis'' " power") or dynamic may refer to: Physics and engineering * Dynamics (mechanics), the study of forces and their effect on motion Brands and ent ...
of the video compared to a conventional gamma curve by using a logarithmic curve for the upper half of the signal values. HLG also increases the dynamic range by not including the linear part of the conventional gamma curve used by Rec. 601 and Rec. 709. The linear part of the conventional gamma curve was used to limit camera noise in low light video but is no longer needed with HDR cameras. HLG is supported in Rec. 2100 with a nominal peak luminance of 1,000 cd/m2 and a system gamma value that can be adjusted depending on background luminance. HLG is supported in
HEVC High Efficiency Video Coding (HEVC), also known as H.265 and MPEG-H Part 2, is a video compression standard designed as part of the MPEG-H project as a successor to the widely used Advanced Video Coding (AVC, H.264, or MPEG-4 Part 10). In co ...
with a formula that is mathematically equivalent to ARIB STD-B67 but has a nominal range of 0 to 1 instead of 0 to 12: V=\begin \sqrt \cdot L_c^ & \frac \ge L_c \ge 0,\!\\ a \cdot \ln(12L_c - b) + c & 1 \ge L_c > \frac \end where *''Lc'' has a nominal range of 0 to 1 and ''V'' is the resulting nonlinear signal *the constants ''a'', ''b'', and ''c'' are defined as ''a'' = 0.17883277, ''b'' = 1 - 4''a'' = 0.28466892, and ''c'' = 0.5 - ''a'' ln(4''a'') = 0.55991073


History


Inception

On May 15, 2015, the BBC announced that they had begun work with the NHK to develop a joint HDR proposal that would be proposed to the
International Telecommunication Union The International Telecommunication Union (ITU)In the other common languages of the ITU: * * is a list of specialized agencies of the United Nations, specialized agency of the United Nations responsible for many matters related to information ...
(ITU). On June 9, 2015, HLG was proposed to the JCT-VC for
High Efficiency Video Coding High Efficiency Video Coding (HEVC), also known as H.265 and MPEG-H Part 2, is a video compression standard designed as part of the MPEG-H project as a successor to the widely used Advanced Video Coding (AVC, H.264, or MPEG-4 Part 10). In compa ...
(HEVC) and added to the June 2015 draft of the screen content coding extensions. Later that year,
Sony is a Japanese multinational conglomerate (company), conglomerate headquartered at Sony City in Minato, Tokyo, Japan. The Sony Group encompasses various businesses, including Sony Corporation (electronics), Sony Semiconductor Solutions (i ...
showed HLG video on a modified HDR display at the
SMPTE The Society of Motion Picture and Television Engineers (SMPTE) (, rarely ), founded by Charles Francis Jenkins in 1916 as the Society of Motion Picture Engineers or SMPE, is a global professional association of engineers, technologists, and e ...
2015 conference. Colorfront announced that their Transkoder 2016 software would support HDR output using HLG. LG announced that their 2015 4K
OLED An organic light-emitting diode (OLED), also known as organic electroluminescent (organic EL) diode, is a type of light-emitting diode (LED) in which the emissive electroluminescent layer is an organic compound film that emits light in respon ...
TVs would support HDR from HLG and perceptual quantizer (PQ). Blackmagic Design released an update for
DaVinci Resolve DaVinci Resolve is a proprietary color grading, color correction, visual effects, and audio post-production video editing application for macOS, Windows, and Linux, developed by Australian company Blackmagic Design. It was originally deve ...
that added support for HLG.
SKY PerfecTV! is a direct broadcast satellite (DBS) service that provides satellite television, audio programming and interactive television services to households in Japan, owned by parent company SKY Perfect JSAT Corporation. SKY PerfecTV! is also a dire ...
announced that they will use HLG to transmit 4K UHDTV HDR programming to their satellite subscribers in Japan. Harmonic Inc. and
NASA The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States ...
announced the HDR capture of an
Atlas V Atlas V is an expendable launch system and the fifth major version in the Atlas (rocket family), Atlas launch vehicle family. It was developed by Lockheed Martin and has been operated by United Launch Alliance (ULA) since 2006. Primarily used to ...
launch which was broadcast the next day on NASA TV using HLG. Vatican Television Center broadcast the ceremony of the Holy Door using HLG and the Rec. 2020 color space.


2016

Industry bodies: * The Ultra HD Forum announced their guidelines for UHD Phase A which includes support for HLG. The Ultra HD Forum also defined HLG with a bit depth of 10-bits, and the Rec. 2020 color space. * The ITU announced Rec. 2100 which defines two HDR transfer functions which are HLG and PQ. * Digital UK published their 2017 specification for Freeview Play which includes support for HDR using HLG. * The
Digital Video Broadcasting Digital Video Broadcasting (DVB) is a set of international open standards for digital television. DVB standards are maintained by the DVB Project, an international industry consortium, and are published by a Joint Technical Committee (JTC) o ...
(DVB) Steering Board approved UHD-1 Phase 2 with an HDR solution that supports HLG and PQ. The specification has been published as DVB Bluebook A157 and will be published by the
ETSI The European Telecommunications Standards Institute (ETSI) is an independent, not-for-profit, standardization organization operating in the field of Information and communications technology, information and communications. ETSI supports the de ...
as TS 101 154 v2.3.1. *
HDMI High-Definition Multimedia Interface (HDMI) is a proprietary digital interface used to transmit high-quality video and audio signals between devices. It is commonly used to connect devices such as televisions, computer monitors, projectors, gam ...
announced that HLG support had been added to the HDMI 2.0b standard. Hardware: *
Leader Electronics Corporation Leadership, is defined as the ability of an individual, group, or organization to "", influence, or guide other individuals, teams, or organizations. "Leadership" is a contested term. Specialist literature debates various viewpoints on the co ...
announced their 12G-SDI waveform monitors with support for HLG. * Harmonic Inc. released an update for the ViBE 4K UHD encoder that added support for HLG. *
Canon Inc. Canon Inc. (; Hepburn: ) is a Japanese multinational corporation headquartered in Ōta, Tokyo, specializing in optical, imaging, and industrial products, such as lenses, cameras, medical equipment, scanners, printers, and semiconductor manu ...
announced that they will release firmware updates for the DP-V2410 and DP-V3010 reference displays to add support for HLG. * Sony announced the PVM-X550 OLED monitor with support for HLG. Sony also announced a firmware update for the BVM-X300 OLED monitor to add support for HLG. * Sony announced that in October they would release a firmware update to add HLG to their BVM-X300 OLED monitor. * Sony announced that their VPL-VW675ES projector would support HLG. * The Trusted Reviews website reported that
Samsung Samsung Group (; stylised as SΛMSUNG) is a South Korean Multinational corporation, multinational manufacturing Conglomerate (company), conglomerate headquartered in the Samsung Town office complex in Seoul. The group consists of numerous a ...
had told them that all of their 2016 HDR TVs could support HLG with a firmware update. * Atomos updated their Shogun Inferno product to include HLG input and output for recording, monitoring, editing and layout from cameras and computers as well as to HLG compatible TVs. Software: *
Avid Technology Avid Technology, Inc. is a global technology company headquartered in Burlington, Massachusetts, and was founded in August 1987 by Bill Warner. It develops software, SaaS, and hardware products used in media and entertainment. History Avid wa ...
released an update for Media Composer that added support for HLG. *
Google Google LLC (, ) is an American multinational corporation and technology company focusing on online advertising, search engine technology, cloud computing, computer software, quantum computing, e-commerce, consumer electronics, and artificial ...
announced
Android TV Android TV is an operating system that runs on smart TVs and related entertainment devices including soundbars, set-top boxes, and digital media players. Developed by Google, it is a closed-source Android distribution. Android TV features a u ...
7.0 which supports HLG. Broadcasters: * Dome Productions announced that they will begin trials of HLG to deliver HDR content. * SKY Perfect JSAT Group announced that on October 4 they will start the world's first 4K HDR broadcasts using HLG. *
Eutelsat Eutelsat S.A. is a French satellite operator. Providing coverage over the entire European continent, the Middle East, Africa, Asia and the Americas, it has been the world's third-largest satellite operator in terms of revenues. Its subsidiary E ...
announced that it will launch a new channel using HLG. *
Google Google LLC (, ) is an American multinational corporation and technology company focusing on online advertising, search engine technology, cloud computing, computer software, quantum computing, e-commerce, consumer electronics, and artificial ...
announced that
YouTube YouTube is an American social media and online video sharing platform owned by Google. YouTube was founded on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim who were three former employees of PayPal. Headquartered in ...
will start streaming HDR videos which can be encoded with HLG or PQ. * The
BBC The British Broadcasting Corporation (BBC) is a British public service broadcaster headquartered at Broadcasting House in London, England. Originally established in 1922 as the British Broadcasting Company, it evolved into its current sta ...
announced that it was adding a 4-minute HLG edit from their Planet Earth II series to its
BBC iPlayer BBC iPlayer (stylised as iPLAYER or BBC iPLAYER) is a video on demand service from the BBC. The service is available Over-the-top media service, over-the-top on a wide range of devices, including Mobile phone, mobile phones and Tablet computer ...
IPTV platform for public UHD testing. * Mediapro/Overon announced that they will transmit the Spanish Football League (LFP) worldwide using 4K HDR broadcasts based in HLG


2017

Industry bodies: * ATSC released the video standard for ATSC 3.0 which includes support for HLG. Hardware: *
LG Corporation LG Corporation (or LG Group), formerly known as Lucky-Goldstar, is a South Korean multinational conglomerate founded by Koo In-hwoi in 1947 and managed by successive generations of his family. It is the fourth-largest company in South Korea ...
announced that their 2017 Super UHD TVs will support HLG. *
Panasonic is a Japanese multinational electronics manufacturer, headquartered in Kadoma, Osaka, Kadoma, Japan. It was founded in 1918 as in Fukushima-ku, Osaka, Fukushima by Kōnosuke Matsushita. The company was incorporated in 1935 and renamed and c ...
announced that their 2017 OLED TV will support HLG. *
Sony is a Japanese multinational conglomerate (company), conglomerate headquartered at Sony City in Minato, Tokyo, Japan. The Sony Group encompasses various businesses, including Sony Corporation (electronics), Sony Semiconductor Solutions (i ...
announced that their 2017 OLED TVs will support HLG. * JVC announced that their 2017 4K projectors will support HLG. * LG Corporation announced that they will add support for HLG to their 2016 OLED TVs and their 2016 Super UHD TVs with a firmware update. * Sony announced that they will add support for HLG to their 2017 4K TVs with a firmware update. * Panasonic announced that they will add support for HLG to several models of their 2016 4K TVs with a firmware update. *
Philips Koninklijke Philips N.V. (), simply branded Philips, is a Dutch multinational health technology company that was founded in Eindhoven in 1891. Since 1997, its world headquarters have been situated in Amsterdam, though the Benelux headquarter ...
announced that their 2017 4K TVs will support HLG and that they will add support for HLG to several models of their 2016 4K TVs with a firmware update. * Sony began releasing firmware updates for several of their 2016 and 2017 Android TV models which adds support for HLG. * Panasonic released firmware update 2.0 for the Panasonic Lumix DC-GH5 which added support for HLG recording. * Panasonic began releasing firmware updates for several of their 2016 TV models which adds support for HLG. *
Qualcomm Qualcomm Incorporated () is an American multinational corporation headquartered in San Diego, California, and Delaware General Corporation Law, incorporated in Delaware. It creates semiconductors, software and services related to wireless techn ...
announced the Qualcomm Snapdragon 845 which includes support for HLG. Software: *
Adobe Systems Adobe Inc. ( ), formerly Adobe Systems Incorporated, is an American software, computer software company based in San Jose, California. It offers a wide range of programs from web design tools, photo manipulation and vector creation, through to ...
announced updates to
Adobe Creative Cloud Adobe Creative Cloud is a set of applications and services from Adobe Inc., Adobe that gives subscribers access to a collection of software used for graphic design, video editing, web development, photography, along with a set of mobile applicat ...
which includes support for HLG. *
Apple An apple is a round, edible fruit produced by an apple tree (''Malus'' spp.). Fruit trees of the orchard or domestic apple (''Malus domestica''), the most widely grown in the genus, are agriculture, cultivated worldwide. The tree originated ...
released a firmware update for Final Cut Pro X which includes support for HLG. Broadcasters: *
Eutelsat Eutelsat S.A. is a French satellite operator. Providing coverage over the entire European continent, the Middle East, Africa, Asia and the Americas, it has been the world's third-largest satellite operator in terms of revenues. Its subsidiary E ...
announced that their Hot Bird video service would include the Travelxp 4K channel which uses HLG. * The BBC announced that Blue Planet II would be available in 4K HDR on the
BBC iPlayer BBC iPlayer (stylised as iPLAYER or BBC iPLAYER) is a video on demand service from the BBC. The service is available Over-the-top media service, over-the-top on a wide range of devices, including Mobile phone, mobile phones and Tablet computer ...
using HLG. Blue Planet II will be available on the BBC iPlayer service from December 10, 2017 to January 16, 2018. The BBC states that almost 400 TV models have support for HLG which includes TV models from Finlux, Hisense, Hitachi, LG, Panasonic, Philips, Samsung, Sony, and Toshiba. *
DirecTV DirecTV, LLC is an American Multichannel television in the United States, multichannel video programming distributor based in El Segundo, California. Originally launched on June 17, 1994, its primary service is a digital Satellite television, s ...
began broadcasting HLG HDR on their 4K Channels 104 and 106.


2018

* Vizio announced HLG support for their 2018 models.


2019

*
Panasonic is a Japanese multinational electronics manufacturer, headquartered in Kadoma, Osaka, Kadoma, Japan. It was founded in 1918 as in Fukushima-ku, Osaka, Fukushima by Kōnosuke Matsushita. The company was incorporated in 1935 and renamed and c ...
announced HLG support in their S1 and S1R full frame mirrorless cameras which will be released in March 2019.


2020

*
Sky UK Sky UK Limited (formerly British Sky Broadcasting Limited (BSkyB)), Trade name, trading as Sky, is a British broadcasting, broadcaster and telecommunications company that provides television, broadband internet, fixed line and mobile telephone ...
announced that their popular
Sky Q Sky Q is a subscription-based television and entertainment service operated by British satellite television provider Sky, as a part of its operations in Austria and Germany, Ireland, Italy and in the UK. The name also refers to the Sky Q set-to ...
box will get HLG support from May 27, 2020. *
Apple An apple is a round, edible fruit produced by an apple tree (''Malus'' spp.). Fruit trees of the orchard or domestic apple (''Malus domestica''), the most widely grown in the genus, are agriculture, cultivated worldwide. The tree originated ...
released the
iPhone 12 The iPhone 12 and iPhone 12 Mini (stylized and marketed as iPhone 12 mini) are smartphones developed and marketed by Apple Inc. They are the fourteenth-generation iPhones, succeeding the iPhone 11. They were unveiled at a virtually held Ap ...
series with HLG video recording support via
Dolby Vision Dolby Vision is a set of technologies developed by Dolby Laboratories for high dynamic range (HDR) video. It covers content creation, distribution, and playback. It includes dynamic metadata that define the aspect ratio and adjust the picture ...
profile 8.4, which adds a Dolby Vision metadata layer on top of HLG footage.


See also

*
Dynamic range Dynamics (from Greek δυναμικός ''dynamikos'' "powerful", from δύναμις ''dynamis'' " power") or dynamic may refer to: Physics and engineering * Dynamics (mechanics), the study of forces and their effect on motion Brands and ent ...
*
Gamma correction Gamma correction or gamma is a Nonlinearity, nonlinear operation used to encode and decode Relative luminance, luminance or CIE 1931 color space#Tristimulus values, tristimulus values in video or still image systems. Gamma correction is, in the s ...
* High-dynamic-range rendering *
High-dynamic-range imaging High dynamic range (HDR), also known as wide dynamic range, extended dynamic range, or expanded dynamic range, is a signal with a higher dynamic range than usual. The term is often used in discussing the dynamic ranges of images, videos, audio or ...
*
High-dynamic-range video High dynamic range (HDR), also known as wide dynamic range, extended dynamic range, or expanded dynamic range, is a signal with a higher dynamic range than usual. The term is often used in discussing the dynamic ranges of images, videos, audio or ...


References


External links


ARIB STD-B67
*T. Borer and A. Cotton
A "Display Independent" High Dynamic Range Television System
BBC Research & Development White Paper WHP 309, September 2015 {{DEFAULTSORT:Hybrid log-gamma High dynamic range Television technology