Last updated on Dec 27, 2018
4K resolution, also called 4K, refers to a horizontal screen display resolution in the order of 4,000 pixels. There are several different 4K resolutions in the fields of digital television and digital cinematography. In television and consumer media, 3840×2160 (4K UHD Flat Cropped) is the dominant 4K standard. In the movie projection industry, 4096×2160 (SMPTE ST 2036-1 or DCI 4K full frame) is the dominant 4K standard.
Applied to any format with a height of 2160 pixels, but it is most commonly used in reference to the 4K UHDTV resolution of 3840×2160 due to its association with the well-known 720p and 1080p HDTV formats. Although 3840×2160 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.