8K resolution, or 8K UHD, is the current highest ultra high definition television (UHDTV) resolution in digital television and digital cinematography. 8K refers to the horizontal resolution of 7,680 pixels, forming the total image dimensions of (7680×4320), otherwise known as 4320p. 
High-resolution displays such as 8K allow the user to have each pixel be indistinguishable to the human eye from an acceptable distance to the screen. 8K resolution can also be used with the purpose of enhancing lesser resolution videos with a combination of cropping technique and/or with downsampling technique used in video and film editing. Resolutions such as 8K allows filmmakers to shoot in a high resolution with a wide lens or at a further distance in the case of potentially dangerous subjects (such as in wildlife documentaries), by intending to zoom and crop digitally in post-production. In this, a portion of the original image is cropped to match a smaller resolution such as the current industry standard for high-definition televisions (4K, 1080p, and 720p).
8K display resolution is the successor to 4K resolution. TV manufacturers pushed to make 4K a new standard by 2017. The feasibility of a fast transition to this new standard is often questionable in view of the absence of broadcasting resources.
As of 2015, few cameras had the capability to shoot video in 8K, with NHK being one of the only companies to have created a small broadcasting camera with an 8K image sensor. By 2016 Red Digital Cinema Camera Company had delivered three 8K cameras in both a Full Frame sensor and Super 35 sensor. Until major sources are available, 8K is unlikely to become a mainstream resolution but filmmakers are pushing for 8K cameras in its advantage to get better 4K footage.
NHK was the first to start research and development of 4320p resolution in the year 1995, later on the format was standardized by SMPTE in Oct 2007, Interface standardized by SMPTE in August 2010 and Recommended as the international standard for television by lTU-R in 2012. Followed by public displays at electronics shows and screenings of Sochi Olympics Games & Public viewings on Feb 2014 and FIFA World Cup Brazil in June 2014 using HEVC with partners AstroDesign and Ikegami Electronics
On January 6, 2015, the MHL Consortium announced the release of the superMHL specification which will support 8K resolution at 120 fps, 48-bit video, the Rec. 2020 color space, high dynamic range support, a 32-pin reversible superMHL connector, and power charging of up to 40 watts.
On March 1, 2016, The Video Electronics Standards Association (VESA) unveiled DisplayPort 1.4, a new format that lets the use of 8K resolution (7680×4320) at 60 Hz with HDRR and 32 audio channels through USB-C.
On April 6, 2013, Astro Design announced the AH-4800, capable of recording 8K resolution. In April 2015 it was announced by Red that their newly unveiled Red Weapon VV is also capable of recording 8K footage. In October 2016 they announced two additional 8K cameras, Red Weapon 8K S35 and Red Epic-W 8K S35.
In 2007, the original 65 mm negative of the 1992 film Baraka was re-scanned at 8K with a film scanner built specifically for the job at FotoKem Laboratories, and used to remaster the 2008 Blu-ray release. Chicago Sun-Times critic Roger Ebert described the Blu-ray release as "the finest video disc I have ever viewed or ever imagined." A similar 8K scan/4K intermediate digital restoration of Lawrence of Arabia was made for Blu-ray and theatrical re-release during 2012 by Sony Pictures to celebrate the film's 50th anniversary. According to Grover Crisp, executive VP of restoration at Sony Pictures, the new 8K scan has such high resolution that when examined, showed a series of fine concentric lines in a pattern "reminiscent of a fingerprint" near the top of the frame. This was caused by the film emulsion melting and cracking in the desert heat during production. Sony had to hire a third party to minimise or eliminate the rippling artifacts in the new restored version.
On May 17, 2013, the Franklin Institute premiered To Space and Back, an 8K×8K, 60 fps, 3D video running approximately 25 minutes. During its first run at the Fels Planetarium it was played at 4K, 60 fps.
On November 2013, NHK screened the experimental-drama short film "The Chorus" at Tokyo Film Festival which was filmed in 8k and 22.2 sound format.
On May 1, 2015, an 8K abstract computer animation was screened at the Filmatic Festival at the University of California, San Diego. The work was created as an assignment in the VIS 40/ICAM 40 Introduction to Computing in the Arts class taught at UCSD by Associate Teaching Professor Brett Stalbaum during the winter quarter of 2015, with each student producing 300 8192×4800 pixel frames. The work's music soundtrack was composed by Mark Matamoros.
Japanese public broadcaster NHK began research and development on 8K in 1995, having spent over $1 billion on R & D since then. Codenamed Super Hi-Vision, NHK also was simultaneously working on the development of 22.2 channel surround sound audio. The world's first 8K television was unveiled by Sharp at the Consumer Electronics Show (CES) in 2012. Experimental transmissions of the resolution were tested with the 2012 Summer Olympics, and at the Cannes Film Festival showcasing Beauties À La Carte, a 27-minute short showcased publicly on a 220” screen, with a three-year roadmap that entails the launch of 8K test broadcasting in 2016, with plans to roll out full 8K services by 2018, and in time for the 2020 Summer Olympics.
|Resolution||Display aspect ratio||Megapixels|
|10240 × 4320||2.37:1 (64:27)||44.2|
|8192 × 4320||1.89:1 (17:9)||35.4|
|7680 × 4320||1.78:1 (16:9)||33.2|
|8192 × 5120||1.60:1 (16:10)||41.9|
|8192 × 8192||1.00:1 (1:1)||67.1|
8K UHD is a resolution of 7680 × 4320 (33.2 megapixels) and is one of the two resolutions of ultra high definition television, the other being 4K UHD. In 2013, a transmission network's capability to carry HDTV resolution was limited by internet speeds and relied on satellite broadcast to transmit the high data rates. The demand is expected to drive the adoption of video compression standards and to place significant pressure on physical communication networks in the near future.
8K UHD has four times the horizontal and vertical resolution of the 1080p HDTV format, with sixteen times as many pixels overall.
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