page_title: 4K resolution
section_title: Chroma subsampling
hierarchical_section_title: 4K resolution / Recording / Chroma subsampling
caption_attribution_description: English: This image shows the difference between four subsampling schemes. Note how similar the color images appear. The lower row shows the resolution of the color information. All four images are from the same High Definition 1920x1080 pixel video frame, reduced to Standard Definition using different codecs. The 4:1:1 image is slightly smaller, since the coded image is in NTSC resolution, 720x480. The others are from PAL resolution images, 720x576. Excerpts enlarged to 200% here, when viewed in full size. (Note that pixel aspect ratios are different in NTSC and PAL, thus both can have 720 pixels per line, and still be 4:3).
context_page_description: 4K resolution refers to a horizontal display resolution of approximately 4,000 pixels. Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 3840 × 2160 is the dominant 4K standard, whereas the movie projection industry uses 4096 × 2160.
  The 4K television market share increased as prices fell dramatically during 2014 and 2015. By 2020, more than half of U.S. households are expected to have 4K-capable TVs, a much faster adoption rate than that of Full HD.
context_section_description: Many consumer electronics such as mobile phones store video footage with 4:2:0 chroma subsampling, which means that color information is stored at only a quarter of the resolution as the brightness information.
  For 1080p video, this means that the color information is stored at only 540p, while 2160p video with 4:2:0 chroma subsampling stores color information at 1080p, providing a color accuracy benefit when viewed on a 1080p monitor.
caption: In full size, this image shows the difference between four subsampling schemes. Note how similar the color images appear. The lower row shows the resolution of the color information.
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