4K resolution, also called 4K, refers to a display device or content having horizontal resolution on the order of 4,000 pixels. Several 4K resolutions exist in the fields of digital television and digital cinematography. In the movie projection industry, Digital Cinema Initiatives (DCI) is the dominant 4K standard. In television and consumer media, 4K UHD or UHD-1 is the dominant 4K standard. By 2015, 4K television market share had increased greatly as prices fell dramatically during 2014 and 2015. By 2025, more than half of US households are anticipated to have a 4K-capable TV (2160p), which would be much faster than the adoption curve of FullHD (1080p).
The name "4K resolution" refers to a horizontal resolution of approximately 4,000 pixels. The use of width to characterize the overall resolution marks a switch from previous television standards such as 480i and 1080p, which categorize media according to its vertical dimension. Using that same convention, 4K UHD would be named 2160p.
There are two main 4K resolution standards:
- The DCI 4K resolution standard, which has a resolution of 4096 x 2160 pixels (256:135, approximately a 1.9:1 aspect ratio). This standard is widely respected by the film and video production industry. The DCI 4K standard has twice the horizontal and vertical resolution of DCI 2K.
- UHD-1, or ultra-high-definition television (UHDTV), is the 4K standard for television. UHD-1 is also called 2160p since it has twice the horizontal and vertical resolution of 1080p. It has a resolution of 3840 x 2160 (16:9, or approximately a 1.78:1 aspect ratio). UHD-1 is used in consumer television and other media, e.g. video games.
Many manufacturers may advertise their products as UHD 4K, or simply 4K, when the term 4K is traditionally reserved for the cinematic, DCI resolution. This often causes great confusion among consumers.
YouTube and the television industry have adopted UHD-1 as its 4K standard and UHD-2 for NHK/BBC R&D's 7680x4320 pixels UHDTV 2 with their basic parameter set is defined by the ITU BT.2020 standard. As of 2014[update], 4K content from major broadcasters remains 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 to provide educational content. However, 4K content is becoming more widely available online including on YouTube, Netflix and Amazon. By 2013, some UHDTV models were available to general consumers in the range of US$600. As of 2015[update], prices on smaller computer and television panels had dropped below US$400.
The first commercially available 4K camera for cinematographic purposes was the Dalsa Origin, released in 2003. YouTube 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 started to use the VP9 video compression standard, saying that it was more suitable for 4K than High Efficiency Video Coding (HEVC); VP9 is being developed by Google, which owns YouTube.
Sony is one of the leading studios promoting UHDTV content, as of 2013[update] 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, 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.
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 As of 2015[update]) 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 normal human vision. On the contrary, home cinema employs 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 screen through 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 flight simulation for Boeing that met the limits of 20/25 visual acuity.
In August 2015, British sports network BT Sport launched a 4K channel, 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—envisioning 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 eligible BT Infinity internet (at least 25 mbps connection) and a 4K-compatible BT TV set-top box (the stream did not count toward bandwidth cap or fair usage policies).
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. Dome Productions, a joint venture of Bell Media and Rogers Media, constructed a "side-by-side" 4K mobile production unit to be shared by Sportsnet and TSN's first 4K telecasts, designed to operate alongside a separate HD truck and utilizing cameras capable of output in both formats. In the future, Dome plans to build additional 4K-specific units, with the original to stay at Rogers Centre to facilitate Sportsnet's 4K Blue Jays telecasts.
On October 5, 2015, alongside the announcement of its 4K set-top box and gigabit internet, Canadian media conglamorate 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. TSN announced its own slate of 4K telecasts to begin on January 20, 2016, including Toronto Raptors games and a slate of 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 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.
|Format||Resolution||Display aspect ratio||Pixels|
|Ultra-high-definition television||3840 × 2160||1.78:1 (16:9)||8,294,400|
|Ultra-wide-television||5120 x 2160||2.37:1 (21:9)||11,059,200|
|DCI 4K (native resolution)||4096 × 2160||1.90:1 (256:135)||8,847,360|
|DCI 4K (CinemaScope cropped)||4096 × 1716||2.39:1||7,028,736|
|DCI 4K (flat cropped)||3996 × 2160||1.85:1||8,631,360|
4K UHD is a resolution of 3840 pixels × 2160 lines (8.3 megapixels, aspect ratio 16:9) and is one of the two resolutions of ultra high definition television targeted towards consumer television, the other being 8K UHD which is 7680 pixels × 4320 lines (33.2 megapixels). UHD has twice the horizontal and vertical resolution of the 1080p HDTV format, with four times as many pixels overall.
The Digital Cinema Initiatives consortium established a standard resolution of 4096 pixels × 2160 lines (8.8 megapixels, aspect ratio 256:135) for 4K movie projection. This is the native resolution for DCI-compliant 4K digital projectors and monitors; pixels are cropped from the top or sides depending on the aspect ratio of the content being projected. The DCI 4K standard has twice the horizontal and vertical resolution of DCI 2K, with four times as many pixels overall. DCI 4K does not conform to the 16:9 aspect ratio, so it is not a multiple of the 1080p display.
4K digital movies may be produced, 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 35mm film.
YouTube, since 2010, and Vimeo 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.
The main advantage of recording video at the 4K standard is that fine spatial detail is resolved well. If the final video quality is reduced to 2K from a 4K recording more detail is apparent than would have been achieved from a 2K recording. Increased fineness and contrast is then possible with output to DVD and Blu-ray. Some cinematographers choose to record at 4K when using the Super 35 film format to offset any resolution loss which may occur during video processing.
- 8K resolution
- Digital cinema
- Aspect ratio (image)
- Rec. 2020: ITU definitions for various aspects of UHDTV
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