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ELI5 - How can my iPhone display a video in 4K if my screen resolution doesn’t have 4K pixels horizontally? (lemmit.online)

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The original was posted on /r/explainlikeimfive by /u/rjo8 on 2023-06-27 01:48:47+00:00.

I understand that screen resolution is the number of pixels measured horizontally and diagonally. Then size of the screen is used to calculate the PPI. But if my screen resolution is 2796x1920 with a PPI of 460, how would I be able to view any video in 4K?

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