Ultra High Definition, or UHD for short, is the next step up from what’s called full HD, the official name for the display resolution of 1,920 by 1,080. (See: How digital technology is reinventing cinema.) A DCI 4K stream is compressed using JPEG2000, can have a bitrate of up to 250Mbps, and employs 12-bit 4:4:4 color depth. The 4K standard is not just a resolution, either: It also defines how 4K content is encoded. 4K refers to the fact that the horizontal pixel count (4,096) is roughly four thousand. In this case, 4K is 4,096 by 2,160 and is exactly four times the previous standard for digital editing and projection (2K, or 2,048 by 1,080). The term “4K” originally derives from the Digital Cinema Initiatives (DCI), a consortium of motion picture studios that standardized a spec for the production and digital projection of 4K content.
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