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Ive heard of 1080p & 720p but what the heck is 4K & 2K? and what is a red ray?

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Ive heard of 1080p & 720p but what the heck is 4K & 2K? and what is a red ray?

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  1. 2K and 4K refer to picture resolutions used (or to be used in the future) in digital cinema (using JPEG 2000).

    red-ray may refer to the red laser used in standard-def DVDs.

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