4K resolution refers to a horizontal
display resolution Display may refer to: Technology * Display device, output device for presenting information, including: ** Cathode ray tube, video display that provides a quality picture, but can be very heavy and deep ** Electronic visual display, output device ...
of approximately 4,000
pixel In digital imaging, a pixel, pel, or picture element is a smallest addressable element in a raster image, or the smallest addressable element in an all points addressable display device; so it is the smallest controllable element of a picture re ...
Digital television Digital television (DTV) is the transmission of television audiovisual signals using digital encoding, in contrast to the earlier analog television technology which used analog signals. At the time of its development it was considered an innova ...
digital cinematography : Digital cinematography is the process of capturing (recording) a motion picture using digital image sensors rather than through film stock. As digital technology has improved in recent years, this practice has become dominant. Since the mid-201 ...
commonly use several different 4K resolutions. In television and consumer media, 38402160 (4K UHD) is the dominant 4K standard, whereas the movie projection industry uses 40962160 ( DCI 4K). The 4K television market share increased as prices fell dramatically during 2014 and 2015.

4K standards and terminology

The term "4K" is generic and refers to any resolution with a horizontal pixel count of approximately 4,000. Several different 4K resolutions have been standardized by various organizations.

DCI Digital Cinema System Specification

In 2005,
Digital Cinema Initiatives Digital Cinema Initiatives, LLC (DCI) is a consortium of major motion picture studios, formed to establish specifications for a common systems architecture for digital cinema systems. The organization was formed in March 2002 by Metro-Goldwyn-Mayer ...
(DCI), a prominent standards organization in the cinema industry, published the Digital Cinema System Specification. This specification establishes standardized 2K and 4K container formats for digital cinema production, with resolutions of and respectively. The resolution of the video content inside follows the SMPTE 428-1 standard, which establishes the following resolutions for a 4K distribution: * 40962160 (full frame, 256135 or ≈1.901 aspect ratio) * 39962160 (flat crop, 1.851 aspect ratio) * 40961716 (CinemaScope crop, ≈2.391 aspect ratio) 2K distributions can have a frame rate of either 24 or 48 FPS, while 4K distributions must have a frame rate of 24FPS. Some articles claim that the terms "2K" and "4K" were coined by DCI and refer exclusively to the 2K and 4K formats defined in the DCI standard. However, usage of these terms in the cinema industry predates the publication of the DCI standard, and they are generally understood as casual terms for any resolution approximately 2000 or 4000 pixels in width, rather than names for specific resolutions.

SMPTE UHDTV standard

In 2007, the
Society of Motion Picture and Television Engineers The Society of Motion Picture and Television Engineers (SMPTE) (, rarely ), founded in 1916 as the Society of Motion Picture Engineers or SMPE, is a global professional association of engineers, technologists, and executives working in the m ...
published SMPTE ST 2036-1, which defines parameters for two UHDTV systems called UHDTV1 and UHDTV2. The standard defines the following characteristics for these systems: * A resolution of (UHDTV1) or (UHDTV2) * Square () pixels, for an overall image aspect ratio of * A framerate of 23.976, 24, 25, 29.97, 30, 50, 59.94, 60, 100, 119.88, or 120Hz with progressive scan * RGB, 4:4:4, 4:2:2, or 4:2:0 pixel encoding * 10bpc (30bit/px) or 12bpc (36bit/px) color depth * Colorimetry characteristics as defined in the standard, including color primaries, quantization parameters, and the electro-optical transfer function. These are the same characteristics later standardized in ITU-R BT.2020. UHDTV1 systems are permitted to use BT.709 color primaries up to 60Hz.

ITU-R UHDTV standard

In 2012, the International Telecommunication Union, Radiocommunication Sector published Recommendation ITU-R BT.2020, also known as the Ultra High Definition Television (UHDTV) standard. It adopts the same image parameters defined in SMPTE ST 2036-1. Although the UHDTV standard does not define any official names for the formats it defines, ITU typically uses the terms "4K", "4K UHD", or "4K UHDTV" to refer to the system in public announcements and press releases ("8K" for the system). In some of ITU's other standards documents, the terms "UHDTV1" and "UHDTV2" are used as shorthand.

CEA Ultra HD

In October 2012, the
Consumer Electronics Association The Consumer Technology Association (CTA) is a standards and trade organization representing more than 2,200 consumer technology companies in the United States. CTA works to influence public policy, holds events such as the Consumer Electronics S ...
(CEA) announced their definition of the term Ultra High-Definition (or Ultra HD) for use with marketing consumer display devices. CEA defines an ''Ultra HD'' product as a TV, monitor, or projector with the following characteristics: * A resolution of or larger * An aspect ratio of 1.1 () or wider * Support for color depth of 8bpc (24bit/px) or higher * At least one HDMI input capable of supporting at 24, 30, and 60Hz progressive scan (though not necessarily with RGB / 4:4:4 color), and HDCP2.2 * Capable of processing images according to the color space defined in ITU-R BT.709 * Capable of upscaling HD content (i.e. 720p / 1080p) The CEA definition does allow manufacturers to use other terms—such as ''4K''—alongside the Ultra HD logo. Since the resolution in CEA's definition is only a minimum requirement, displays with higher resolutions such as or also qualify as "Ultra HD" displays, provided they meet the other requirements.

2160p resolution

Some 4K resolutions, like , are often casually referred to as ''2160p''. This name follows from the previous naming convention used by
HDTV High-definition television (HD) describes a television system providing an image resolution of substantially higher resolution than the previous generation of technologies. The term has been used since 1936, but in modern times refers to the genera ...
SDTV Standard-definition television (SDTV, SD, often shortened to standard definition) is a television system which uses a resolution that is not considered to be either high or enhanced definition. SDTV and high-definition television (HDTV) are th ...
formats, which refer to a format by the number of pixels/lines along the vertical axis (such as "1080p" for progressive scan, or "480i" for the 480-line interlaced SDTV formats) rather than the horizontal pixel count (≈4000 or "4K" for ). The term "2160p" could be applied to any format with a height of 2160 pixels, but it is most commonly used in reference to the 4K UHDTV resolution of due to its association with the well-known 720p and 1080p HDTV formats. Although is both a 4K resolution and a 2160p resolution, these terms cannot always be used interchangeably since not all 4K resolutions are 2160 pixels tall, and not all 2160p resolutions are ≈4000 pixels wide. However, some companies have begun using the term "4K" to describe devices with support for a 2160p resolution, even if it is not close to 4000 pixels wide. For example, many "4K" dash cams only support a resolution of (43); although this is a 2160p resolution, it is not a 4K resolution. Conversely, Samsung released a ( 6427) TV, but marketed it as a "4K" TV despite its 5K-class resolution.

M+ or RGBW TV controversy

In 2015
LG Display LG Display (Korean: LG 디스플레이) is one of the world's largest manufacturer and supplier of thin-film transistor liquid crystal display (TFT-LCD) panels, OLEDs and flexible displays. LG Display is headquartered in Seoul, South Korea, and ...
announced the implementation of a new technology called M+ which is the addition of white subpixel along with the regular RGB dots in their IPS panel technology. The media and internet users later called this "RGBW" TVs because of the white sub pixel. Most of the new M+ technology was employed on 4K TV sets which led to a controversy after tests showed that the addition of a white sub pixel replacing the traditional RGB structure would reduce the resolution by around 25%. After tests done by
Intertek Intertek Group plc is a British multinational assurance, inspection, product testing and certification company headquartered in London, England. It is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index. History Intert ...
in which the technical aspects of LG M+ TVs were analyzed and they concluded that "the addressable resolution display is 2,880 X 2,160 for each red, green, blue", in other words, the LG TVs were technically 2.8K as it became known in the controversy. Although LG Display has developed this technology for use in notebook display, outdoor and smartphones, it is more popular in the TV market due to the supposed 4K UHD marketed resolution but still being incapable of achieving true 4K UHD resolution as defined by the CTA as 3840x2160 active pixels with 8-bit color. This negatively impacts the rendering of text, making it a bit fuzzier, which is especially noticeable when a TV is used as a PC monitor.


Video sharing website
YouTube#REDIRECT YouTube {{R from miscapitalization ...
and the television industry have adopted 38402160 as their 4K standard. , 4K content from major broadcasters remained limited. On April 11, 2013, Bulb TV created by Canadian serial entrepreneur Evan Kosiner became the first broadcaster to provide a 4K linear channel and VOD content to cable and satellite companies in North America. The channel is licensed by the
Canadian Radio-Television and Telecommunications Commission The Canadian Radio-television and Telecommunications Commission (CRTC; french: Conseil de la radiodiffusion et des télécommunications canadiennes, links=) is a public organization in Canada with mandate as a regulatory agency for broadcasting ...
to provide educational content. However, 4K content is becoming more widely available online including on Apple TV, YouTube, Netflix, and Amazon. By 2013, some UHDTV models were available to general consumers in the range of US$600. , prices on smaller computer and television panels had dropped below US$400.


In 2014, 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) of ...
Project released a new set of standards intended to guide the implementation of high resolution content in broadcast television. Dubbed DVB-UHDTV, it establishes two standards, known as UHD-1 (for 4K content) and UHD-2 (for 8K content). These standards use resolutions of 38402160 and 76804320 respectively, with framerates of up to 60Hz, color depth up to 10bpc (30bit/px), and
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 comparis ...
encoding for transmission. DVB is currently focusing on the implementation of the UHD-1 standard. DVB finalized UHD-1 Phase 2 in 2016, with the introduction of service by broadcasters expected in 2017. UHD-1 Phase 2 adds features such as
high dynamic range High dynamic range (HDR) is a dynamic range higher than usual. The term is often used in discussing display devices, photography, 3D rendering, and sound recording including digital imaging and digital audio production. The term may apply to an anal ...
(using and PQ at 10 or 12 bits), wide color gamut ( BT. 2020/
2100 In contemporary history, the third millennium of the anno Domini or Common Era in the Gregorian calendar is the current millennium spanning the years 2001 to 3000 (21st to 30th centuries). Ongoing futures studies seek to understand what is likel ...
colorimetry), and
high frame rate In motion picture technology—either film or video—high frame rate (HFR) refers to higher frame rates than typical prior practice. The frame rate for motion picture film cameras was typically 24 frames per second (fps) with multiple flashes on e ...
(up to 120Hz).

Video streaming

YouTube, since 2010, and
Vimeo Vimeo () is an American video hosting, sharing, and services platform headquartered in New York City. Vimeo focuses on the delivery of high-definition video across a range of devices. Vimeo's business model is through software as a service (SaaS) ...
allow a maximum upload resolution of 4096 × 3072 pixels (12.6 megapixels, aspect ratio 4:3). Vimeo's 4K content is currently limited to mostly nature documentaries and tech coverage.
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 comparis ...
(HEVC or H.265) should allow streaming 4K content with a bandwidth of 20 to 30
Mbit/s In telecommunications, data-transfer rate is the average number of bits (bitrate), characters or symbols (baudrate), or data blocks per unit time passing through a communication link in a data-transmission system. Common data rate units are multip ...
. In January 2014, Naughty America launched the first adult video service streaming in 4K.

Mobile phone cameras

The first mobile phones to be able to record at 2160p (3840×2160) were released in late 2013, including the
Samsung Galaxy Note 3 The Samsung Galaxy Note 3 is an Android phablet smartphone produced by Samsung Electronics as part of the Samsung Galaxy Note series. The Galaxy Note 3 was unveiled on September 4, 2013, with its worldwide release beginning later in the month. Ser ...
, which is able to record 2160p at 30 frames per second. In the year 2014, the
OnePlus One The OnePlus One (colloquially abbreviated to OPO) is an Android smartphone manufactured by OnePlus. Unveiled in April 2014, it is the first product by OnePlus. The OnePlus One was designed to compare favorably – in performance, quality, and pr ...
was released with the option to record DCi 4K (4096 × 2160) at 24 frames per second, as well as
LG G3 The LG G3 is an Android smartphone developed by LG Electronics as part of the LG G series. First released in South Korea on May 28, 2014, it is a successor to 2013's LG G2. Inheriting design elements from the G2, such as its thin screen bezels and ...
Samsung Galaxy Note 4 The Samsung Galaxy Note 4 is an Android smartphone developed and produced by Samsung Electronics. The Galaxy Note 4 was unveiled during a Samsung press conference at IFA Berlin on 3 September 2014 and was released globally in October 2014. It is th ...
optical image stabilization Image stabilization (IS) is a family of techniques that reduce blurring associated with the motion of a camera or other imaging device during exposure. Generally, it compensates for pan and tilt (angular movement, equivalent to yaw and pitch) of ...
. In the years 2017 and 2018, mobile phone chipsets reached sufficient processing power that mobile phone vendors started releasing mobile phones that allow recording 2160p footage at 60 frames per second for a smoother and more realistic appearance.


In 1984,
Hitachi () is a Japanese multinational conglomerate company headquartered in Chiyoda, Tokyo, Japan. It is the parent company of the Hitachi Group (''Hitachi Gurūpu'') and had formed part of the Nissan ''zaibatsu'' and later DKB Group of companies befor ...
released the
CMOS#REDIRECT CMOS {{R from other capitalisation ...
graphics processor A graphics processing unit (GPU) is a specialized electronic circuit designed to rapidly manipulate and alter memory to accelerate the creation of images in a frame buffer intended for output to a display device. GPUs are used in embedded systems ...
ARTC HD63484, which was capable of displaying up to 4K resolution when in
monochrome during the 1889 Exposition Universelle File:Parrot EGA monochrome palette.png">A photograph of a macaw rendered with a monochrome palette of a limited number of shades A monochromic image is composed of one color (or lightness, values of one ...
mode.GPU History: Hitachi ARTC HD63484. The second graphics processor.
IEEE Computer Society IEEE Computer Society (sometimes abbreviated the Computer Society or CS) is a professional society of the Institute of Electrical and Electronics Engineers (IEEE). Its purpose and scope is "to advance the theory, practice, and application of comput ...
The resolution was targeted at the bit-mapped
desktop publishing Desktop publishing (DTP) is the creation of documents using page layout software on a personal ("desktop") computer. It was first used almost exclusively for print publications, but now it also assists in the creation of various forms of online con ...
market. The first commercially available 4K camera for cinematographic purposes was the Dalsa Origin, released in 2003. 4K technology was developed by several research groups in universities around the world, such as
University of California, San Diego The University of California, San Diego (UC San Diego or, colloquially, UCSD) is a public land-grant research university in San Diego, California. Established in 1960 near the pre-existing Scripps Institution of Oceanography, UC San Diego is th ...
CALIT2 The California Institute for Telecommunications and Information Technology (Calit2, previously Cal(IT)2), also referred to as the Qualcomm Institute at its San Diego branch, is a $400 million academic research institution jointly run by the Universi ...
, Keio University, Naval Postgraduate School and others that realized several demonstrations in venues such as IGrid in 2004 and CineGrid.
YouTube#REDIRECT YouTube {{R from miscapitalization ...
began supporting 4K for video uploads in 2010 as a result of leading manufacturers producing 4K cameras. Users could view 4K video by selecting "Original" from the quality settings until December 2013, when the 2160p option appeared in the quality menu. In November 2013, YouTube began to use the VP9 video compression standard, saying that it was more suitable for 4K than
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 comparis ...
(HEVC). Google, which owns YouTube, developed VP9. Theaters began projecting movies at 4K resolution in 2011. Sony was offering 4K projectors as early as 2004. The first 4K Home cinema, home theater projector was released by Sony in 2012. Sony is one of the leading studios promoting UHDTV content, offering a little over 70 movie and television titles via digital download to a specialized player that stores and decodes the video. The large files (≈40GB), distributed through consumer broadband connections, raise concerns about data caps. In 2014, Netflix began streaming ''House of Cards (U.S. TV series), House of Cards'', ''Breaking Bad'', and "some nature documentaries" at 4K to compatible televisions with an HEVC decoder. Most 4K televisions sold in 2013 did not natively support HEVC, with most major manufacturers announcing support in 2014. Amazon Studios began shooting their full-length original series and new pilots with 4K resolution in 2014. They are now currently available though Amazon Video. In March 2016 the first players and discs for Ultra HD Blu-ray—a physical optical disc format supporting 4K resolution and HDR at 60 frames per second—were released. On August 2, 2016 Microsoft released the Xbox One S, which supports 4K streaming and has an Ultra HD Blu-ray disc drive, but does not support 4K gaming. On November 10, 2016 Sony released the PlayStation 4 Pro, which supports 4K streaming and gaming, though many games use checkerboard rendering or are upscaled 4K. On November 7, 2017, Microsoft released the Xbox One X, which supports of 4K streaming and gaming, though not all games are rendered at native 4K.

Home video projection

Though experiencing rapid price drops beginning in 2013 for viewing devices, the home cinema digital video projector market saw little expansion, with only a few manufacturers (only Sony ) offering limited 4K-capable lineups, with native 4K projectors commanding five-figure price tags well into 2015 before finally breaking the US$10,000 barrier. Critics state that at normal direct-view panel size and viewing distances, the extra pixels of 4K are redundant at the ability of Visual acuity, normal human vision. Projection home cinemas, on the other hand, employ much larger screen sizes without necessarily increasing viewing distance to scale. JVC has used a technique known as "e-shift" to extrapolate extra pixels from 1080p sources to display 4K on screens through Video scaler, upscaling or from native 4K sources at a much lower price than native 4K projectors. This technology of non-native 4K entered its fourth generation for 2016. JVC used this same technology to provide 8K resolution, 8K flight simulation for Boeing that met the limits of 20/25 visual acuity. Pixel shifting, as described here, was pioneered in the consumer space by JVC, and later in the commercial space by Epson. That said, it is not the same thing as "true" 4K. More recently, some DLP projectors claim 4K UHD (which the JVCs and Epsons do not claim). As noted above, DCI 4K is 40962160, while 4K UHD is 38402160, producing a slight difference in aspect ratio rather than a significant difference in resolution. Traditional displays, such as LCD or OLED, are 3840 pixels across the screen, with each pixel being 1/3840th of the screen width. They do not overlap—if they did, they would suffer reduced detail. The diameter of each pixel is basically 1/3840th of the screen width or 1/2160th of the screen height - either gives the same size pixel. That 38402160 works out to 8.3 megapixels, the official resolution of 4K UHD (and therefore Blu-ray UHD discs). The 4K UHD standard does not specify how large the pixels are, so a 4K UHD projector (Optoma, BenQ, Dell, et al.) counts because these projectors have a 2718 × 1528 pixel structure. Those projectors process the true 4K of data and project it with overlapping pixels, which is what pixel shifting is. Unfortunately, each of those pixels is far larger: each one has 50% more area than true 4K. Pixel shifting projectors project a pixel, shift it up to the right, by a half diameter, and project it again, with modified data, but that second pixel overlaps the first. In other words, pixel shifting cannot produce adjacent vertical lines of RGBRGB or other colors where each line is one pixel (1/3840th of the screen) wide. Adjacent red and green pixels would end up looking like yellow, with a fringe on one side of red, on the other of green - except that the next line of pixels overlaps as well, changing the color of that fringe. 4K UHD or 1080p pixel shifting cannot reveal the fine detail of a true 4K projector such as those Sony ships (business, education and home markets). Also, JVC has one true 4K projector priced at $35,000 (as of mid-2017). So while 4K UHD appears like it has a pixel structures with 1/4 the area of 1080p, that does not happen with pixel shifting. Only a true 4K projector offers that level of resolution. This is why "true" 4K projectors cost so much more than 4K UHD projectors with otherwise similar feature sets. They produce smaller pixels, finer resolution, no compromising of detail or color from overlapping pixels. By comparison, the slight difference in aspect ratio between DCI and 3840 × 2160 pixel displays without overlap is insignificant relative to the amount of detail. Some companies like Kaleidescape offer media servers that allow for 4K UHD Blu-ray movies with high dynamic range in a home theater.


In November 2014, United States satellite provider DirecTV became the first pay TV provider to offer access to 4K content, although limited to selected video-on-demand films. In August 2015, British sports network BT Sport launched a 4K feed, with its first broadcast being the 2015 FA Community Shield football match. Two production units were used, producing the traditional broadcast in high-definition, and a separate 4K broadcast. As the network did not want to mix 4K footage with upconverted HD footage, this telecast did not feature traditional studio segments at pre-game or half-time, but those hosted from the stadium by the match commentators using a 4K camera. BT envisioned that if viewers wanted to watch studio analysis, they would switch to the HD broadcast and then back for the game. Footage was compressed using H.264 encoders and transmitted to BT Tower, where it was then transmitted back to BT Sport studios and decompressed for distribution, via 4K-compatible BT TV set-top boxes on an eligible BT Infinity internet plan with at least a 25 Mbit/s connection. In late 2015 and January 2016, three Canadian television providers including Quebec-based Videotron, Ontario-based Rogers Cable, and Bell Fibe TV, announced that they would begin to offer 4K compatible set-top boxes that can stream 4K content to subscribers over gigabit internet service. On October 5, 2015, alongside the announcement of its 4K set-top box and gigabit internet, Canadian media conglomerate Rogers Communications announced that it planned to produce 101 sports telecasts in 4K in 2016 via its Sportsnet division, including all Toronto Blue Jays home games, and "marquee" National Hockey League games beginning in January 2016. Bell Media announced via its The Sports Network, TSN division a slate of 4K telecasts to begin on January 20, 2016, including selected Toronto Raptors games and regional NHL games. On January 14, 2016, in cooperation with BT Sport, Sportsnet broadcast the first ever NBA game produced in 4K a Toronto Raptors/Orlando Magic game at O2 Arena (London), O2 Arena in London, England. On January 20, also during a Raptors game, TSN presented the first live 4K telecast produced in North America. Three days later, Sportsnet presented the first NHL game in 4K. Dome Productions, a joint venture of Bell Media and Rogers Media (the respective owners of TSN and Sportsnet), constructed a "side-by-side" 4K mobile production unit shared by Sportsnet and TSN's first 4K telecasts; it was designed to operate alongside a separate HD truck and utilize cameras capable of output in both formats. For the opening game of the 2016 Toronto Blue Jays season, Dome constructed "Trillium" a production truck integrating both 4K and 1080i high-definition units. Bell Media's CTV Television, CTV also broadcast the Juno Awards of 2016, 2016 Juno Awards in 4K as the first awards show presented in the format. In February 2016, Univision trialed 4K by producing a closed circuit telecast of a football friendly between the national teams of Mexican national football team, Mexico and Senegal national football team, Senegal from Miami in the format. The broadcast was streamed privately to several special viewing locations. Univision aimed to develop a 4K streaming app to publicly televise the final of Copa América Centenario in 4K. In March 2016, DirecTV and CBS Sports announced that they would produce the "Amen Corner" supplemental coverage from the Masters Tournament, Masters golf tournament in 4K. In late 2016, Telus TV announced that they would begin to offer 4K compatible set-top boxes. After having trialed the technology in limited matches at the 2013 FIFA Confederations Cup, and the 2014 FIFA World Cup (via private tests and public viewings in the host city of Rio de Janeiro), the 2018 FIFA World Cup was the first FIFA World Cup in which all matches were produced in 4K. Host Broadcasting Services stated that at least 75% of the broadcast cut on each match would come from 4K cameras (covering the majority of main angles), with instant replays and some camera angles being upconverted from 1080p sources. These broadcasts were made available from selected rightsholders, such as the BBC in the United Kingdom, and selected television providers in the United States.



The resolution of is the dominant 4K resolution in the consumer media and display industries. This is the resolution of the UHDTV1 format defined in SMPTE ST 2036-1, as well as the 4K Ultra-high-definition television, UHDTV format defined by ITU-R in Rec. 2020, and is also the minimum resolution for CEA's definition of ''Ultra HD'' displays and projectors. The resolution of was also chosen by the Digital Video Broadcasting, DVB project for their 4K broadcasting standard, UHD-1. This resolution has an aspect ratio of 169, with 8,294,400 total pixels. It is exactly double the horizontal and vertical resolution of 1080p () for a total of 4 times as many pixels, and triple the horizontal and vertical resolution of 720p () for a total of 9 times as many pixels. It is sometimes referred to as "2160p", based on the naming patterns established by the previous 720p and 1080p
HDTV High-definition television (HD) describes a television system providing an image resolution of substantially higher resolution than the previous generation of technologies. The term has been used since 1936, but in modern times refers to the genera ...
standards. In 2013, televisions capable of displaying UHD resolutions were seen by consumer electronics companies as the next trigger for an upgrade cycle after a lack of consumer interest in 3D television.


This resolution is used mainly in digital cinema production, and has a total of 8,847,360 pixels with an aspect ratio of 256135 (≈1910). It was standardized as the resolution of the 4K container format defined by
Digital Cinema Initiatives Digital Cinema Initiatives, LLC (DCI) is a consortium of major motion picture studios, formed to establish specifications for a common systems architecture for digital cinema systems. The organization was formed in March 2002 by Metro-Goldwyn-Mayer ...
in the Digital Cinema System specification, and is the native resolution of all DCI-compliant 4K digital projectors and computer monitor, monitors. The DCI specification allows several different resolutions for the content inside the container, depending on the desired aspect ratio. The allowed resolutions are defined in SMPTE 428-1: * 40962160 (full frame, 256135 or ≈1.901 aspect ratio) * 39962160 (flat crop, 1.851 aspect ratio) * 40961716 (CinemaScope crop, ≈2.391 aspect ratio) The DCI 4K standard has twice the horizontal and vertical resolution of DCI 2K (), with four times as many pixels overall. Digital movies made in 4K may be produced, motion picture film scanner, scanned, or stored in a number of other resolutions depending on what storage aspect ratio is used. In the digital cinema production chain, a resolution of 4096 × 3112 is often used for acquiring "open gate" or anamorphic input material, a resolution based on the historical resolution of scanned Super 35 mm film.

Other 4K resolutions

Various other non-standardized 4K resolutions have been used in displays, including: * 40962560 (1.601 or 16:10 aspect ratio, 1610); this resolution was used in the Canon Inc., Canon DP-V3010, a 4K reference monitor designed for reviewing cinema footage in post-production, released in 2013. * 40962304 (1.1 or 16:9 aspect ratio, 169); this resolution was used in the LG UltraFine 22MD4KA 4K monitor, jointly announced by LG and Apple Inc., Apple in 2016 and used in the 21.5" 4K Retina display, Retina iMac computer. * 38402400 (1.601 or 1610); this resolution was used in the IBM IBM T220, T220 and T221 monitors, released in 2001 and 2002 respectively. This resolution is also referred to as "WQUXGA", and is four times the resolution of WUXGA (19201200). * 38401600 (2.401 or 21:9 aspect ratio, 125); a number of computer monitors with this resolution have been produced, the first being the LG 38UC99-W released in 2016. This resolution is equivalent to WQXGA (25601600) extended in width by 50%, or 38402160 reduced in height by ≈26%. LG refers to this resolution as "WQHD+" (Wide Quad HD+), while Acer uses the term "UW-QHD+" (Ultra-wide Quad HD+) and some media outlets have used the term "UW4K" (Ultra-wide 4K). * 38401080 (3.1 or 329); this resolution was first used in the Samsung C49HG70, a curved gaming monitor released in 2017. This resolution is equivalent to dual 1080p displays (19201080) side-by-side, but with no border interrupting the image. It is also exactly one half of a 4K UHD (38402160) display. Samsung refers to this resolution as "DFHD" (Dual Full HD).


Detail benefit

The main advantage of recording video at the 4K standard is that fine spatial detail is resolved well. Individual still frames extracted from 3840×2160-pixel video footage can act as 8.3 megapixel still photographs, while only 2.1 megapixels at 1080p and 1.3 megapixels at 720p. If the final video quality is reduced to 2K from a 4K recording, more detail is apparent than would have been achieved from a native 2K recording. Increased fineness and contrast (vision), contrast is then possible with output to DVD and Blu-ray. Some cinematographers record at 4K with the Super 35 film format to offset any resolution loss that may occur during video processing.

Chroma subsampling

Many consumer electronics such as mobile phones store video footage in format with 4:2:0 chroma subsampling, which records color information at only one quarter the resolution as the brightness information.Poynton, Charles. "YUV and ''luminance'' considered harmful: A plea for precise terminology in video

/ref> For video, this means that the color information is only stored at .''Why 4K video looks better on a 1080p screen'' – The Daily Note (with graphics explaining chroma subsampling

Bit rates

Consumer cameras and mobile phones record 2160p footage at much higher bit rates (usually 50 to 100Mbit/s) than 1080p (usually 10 to 30Mbit/s). This higher bit rate reduces the visibility of ugly compression artefacts, even if viewed on monitors with a lower resolution than 2160p.

See also

* 1080p, 1080p Full HD digital video format with a resolution of * List of 4K video recording devices * 2K resolution digital video formats with a horizontal resolution of around 2,000 pixels * 5K resolution digital video formats with a horizontal resolution of around 5,000 pixels, aimed at non-television computer monitor usage * 8K resolution digital video formats with a horizontal resolution of around 8,000 pixels * 10K resolution digital video formats with a horizontal resolution of around 10,000 pixels * 16K resolution experimental VR format * Aspect ratio (image) proportional relationship between an image's width and height * Digital cinema * Graphics display resolution *
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 comparis ...
(HEVC) video standard that supports 4K & 8K UHDTV and resolutions up to * Rec. 2020 ITU-R recommendation for UHDTV, defining formats with resolutions of 4K () and 8K () * Ultra-high-definition television (UHDTV) – various standards for high-resolution television * Ultrawide formats


External links


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Official sites of NHK

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{{DSLR cameras with movie mode
Digital imaging Film and video technology Ultra-high-definition television