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The name 4K resolution refers to a horizontal resolution of approximately 4,000 pixels. The use of width to characterize the overall resolution marks a switch from previous television standards such as 480i and 1080p, which categorize media according to its vertical dimension.
Even if you have the money, 4K still isn't there yet. At least we seem to be settling on an actual resolution standardâ3,840 by 2,160 makes the most sense, as it's exactly four times 1080p. Many recent movies shot in 4K are at 4,096 by 2,160, an earlier digital cinema standard.