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A comment on When 13.3 is greater than 14. Parent comment

Re:When 13.3 is greater than 14 by dheera on Friday November 13, 2020 @04:08PM (#25087519)
No, it's 4K because it's approximately 4000 (actually 3840) pixels in the horizontal dimension. It has nothing to do with 4 times 1080p.

640x480 ("480p" <-- vertical)

1280x720 ("720p" <-- vertical)

1920x1080 ("1080p" <-- vertical)

3840x2160 ("4K" <-- they marketing departments suddenly started measuring horizontal)

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Re:When 13.3 is greater than 14 by kalleboo on Friday November 13, 2020 @11:50PM (#25090383)
640x480 (VGA), 800x600 (SVGA), etc came from the computer industry since they had 4:3 CRTs

720p, 1080p came from the TV industry since they always counted video in "lines" (NTSC is 525 lines)

4K came from the movie industry (the 2005 Digital Cinema specification), since movies have wildly different aspect ratios so counting the vertical doesn't make sense (specifically, it's very rare for movies to be 16:9!)

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Re:When 13.3 is greater than 14 by Tijdreiziger on Friday November 13, 2020 @05:52PM (#25088516)
4K is the marketing term, i.e.:

4K > Full HD > HD > SD (marketing terms)

2160p/i > 1080p/i > 720p/ > 480p/i / 576p/i (resolutions)

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