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Some of the most common video resolutions used today are: High Definition (HD), 4K and 8K. Some studios use another resolution, 6K, as an intermediary format, though that resolution is rarely used for delivery. There are other resolutions, but HD, 4K, 6K, and 8K provide a good overview of what is found in real world productions.
Unfortunately, there is some confusion about the actual resolution of 4K and 8K video. When referencing 4K and 8K resolutions, two sets of numbers are used. Consumer TV manufacturers came up with 4K resolutions by doubling the height and width of HD resolution (and then doubling those numbers again for 8K resolution). The cinematic world used the Digital Cinema Initiatives (DCI) specifications which determined 4K and 8K resolutions by multiplying the height and width of 2K resolution.
To separate out these competing numbers, TV 4K and 8K images are referred to as Ultra-HD (UHD) 4K and UHD 8K. Cinema resolutions are referred to as 4K DCI or 8K DCI. Confusion arises when video is referred to as 4K or 8K with no mention of UHD or DCI, leaving the actual resolution in question.
The chart below illustrates various resolutions, both UHD and DCI. In terms of absolute resolution, 4K resolution has four times the resolution of HD (or 2K DCI) and 8K has four times the resolution of 4K. If the height and width of an image are doubled, the resulting image has four times greater resolution.