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What is 4K? That’s a good question without a simple answer. Nominally, 4K denotes a moving-image system with 4096 active (image-carrying) picture elements (pixels) per row. At one time, it was considered to have 2048 active rows; now 2160 — twice HDTV’s 1080 — is more common. But, if twice HDTV is appropriate vertically, why not horizontally, too? Sure enough, some call 3840 pixels across the screen 4K (others call it Quad HD, because twice the number horizontally and vertically results in four times the number of pixels of 1080-line HDTV).
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What is 4K? That’s a good question without a simple answer. Nominally, 4K denotes a moving-image system with 4096 active (image-carrying) picture elements (pixels) per row. At one time, it was considered to have 2048 active rows; now 2160 — twice HDTV’s 1080 — is more common. But, if twice HDTV is appropriate vertically, why not horizontally, too? Sure enough, some call 3840 pixels across the screen 4K (others call it Quad HD, because twice the number horizontally and vertically results in four times the number of pixels of 1080-line HDTV).
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