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4K is an emerging standard for resolution in digital film and computer graphics. The name comes from its approximately 4,000 pixels of horizontal resolution. The fact that it describes the horizontal resolution is contrary to the standard resolutions 720p and 1080p, which represent the number of vertical pixels. 4K represents the horizontal resolution because there are numerous aspect ratios used in film — so while the horizontal resolution stays constant, the vertical resolution depends on the video source (a.k.a. letterboxing). There are several different resolutions that qualify as 4K.

[edit] Computer formats

Quad Full High Definition (QFHD), at 3840 x 2160 pixels, doubles the 1080p high-definition television standard in both the vertical and horizontal dimensions. However, it has often been debated if this resolution should be classified as 4K since it is fewer than 4000 pixels horizontally.

In July 2010, YouTube began streaming certain videos at resolutions from 4096 x 2304 (in the 16:9 aspect ratio) to 4096 x 3072 (4:3).^[1] Registered users at YouTube are allowed to upload videos with a resolution higher than 1080p.

[edit] Digital film

In digital film, the pixel resolution varies by aspect ratio. Examples of 4K digital recording devices are the Dalsa Origin (announced in 2003 and released in 2006 as the first commercially available 4K digital cinema camera), the Red One (announced in 2006 and released in 2007), the Red Epic (released in early 2011), and the Sony CineAlta F65 (announced in April 2011). The Dalsa Origin system records images at a resolution of 4096 x 2048 and the Red One records images at 4096 x 2304.

Digital film standards^[2] Standard

Resolution

DAR

Pixels

Full Aperture 4K 4096 x 3112 1.32:1 12,746,752 Academy 4K 3656 × 2664 1.37:1 9,739,584 Digital cinema 4K 4096 × 1714 2.39:1 7,020,544 Digital cinema 4K 3996 × 2160 1.85:1 8,631,360 Post-production digital working resolutions

Standard	Resolution	DAR	PAR	Pixels
Full Aperture 4K	4096 × 3112	4:3	1:1	12,746,752
Academy 4K	3656 × 2664	1.37:1	1:1	9,739,584

[edit] See also

• 8K
• Digital cinema
• Ultra High Definition Television

[edit] References

1. ^ Ramesh Sarukkai (2010-07-09). "What's bigger than 1080p? 4K video comes to YouTube". http://youtube-global.blogspot.com/2010/07/whats-bigger-than-1080p-4k-video-comes.html. Retrieved 2010-07-09. 
2. ^ "4K resolution Definition from PC Magazine Encyclopedia". PC Magazine. 1994-12-01. http://www.pcmag.com/encyclopedia_term/0,2542,t=4K+resolution&i=57419,00.asp. Retrieved 2010-05-28. 

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Categories: Digital imaging | Film and video technology