(Read: 8K UHDTV: How do you send a 48Gbps TV signal over terrestrial airwaves?) The 8K UHD spec should probably be renamed QUHD (Quad Ultra HD). It’s reasonable to refer to these two UHD variants as 4K UHD and 8K UHD. There’s 3,840 by 2,160, and then there’s a big step up, to 7,680 by 4,320, also called UHD. The UHD standard is actually two standards. But the vast majority are 3,840 by 2,160, for a 1.78:1 aspect ratio. There are some panels that are 4,096 by 2,160, which adds up to an aspect ratio of 1.9:1. Despite this, almost every TV or monitor you see advertised as 4K is actually UHD. It’s not the same as the 4K resolution made above. UHD quadruples that resolution to 3,840 by 2,160. It’s the official name for the display resolution of 1,920 by 1,080. The next step up from HD is UHD, Ultra High Definition. (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 4x the previous standard for digital editing and projection (2K, or 2,048 by 1,080). This consortium standardized a spec for the production and digital projection of 4K content. ![]() The term “4K” originally derives from the Digital Cinema Initiatives (DCI).
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