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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 athenot on Friday November 13, 2020 @04:06PM (#25087506)
It's 4k because it's an HD resolution (1080) doubled horizontally and vertically.

If this is HD:

    ┏━━━━┓  
    ┃    ┃  
    ┗━━━━┛
Then 4 of these tiled become 4k:

    ┏━━━━┳━━━━┓
    ┃    ┃    ┃
    ┣━━━━╋━━━━┫
    ┃    ┃    ┃
    ┗━━━━┻━━━━┛
I used to have 4 separate HD monitors laid out horizontally on my desk, and in terms of pixel realestate, a 4k effectively replaces them... until retina/high density displays became affordable. Now my 5k monitor is effectively the realestate of 4 HD monitors, but nice and smooth.
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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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Re:When 13.3 is greater than 14 by jandrese on Friday November 13, 2020 @05:04PM (#25088074)
If that were the case wouldn't it be called 4x instead of 4k?
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