Hey,
HD is 16:9 *80 (1280:720), full HD is 16:9 * 120 (1920:1080).
The question is for what those values 80 or 120 stands for? Tried to figure it on my own, but no luck.
In: 5
You’ll also find that 16:9*160 = 2560:1440. This is double 1280:720.
4k is 16:9*240 = 3840:2160 which is double 1920:1080.
Why does it scale like this? Because we like scaling by factors of two. But you would say, that multiplier 80, 120, 160, 240 doesn’t scale by 2. It scales by about 1.33-1.5.
The area or number of pixels does scale by roughly 2. Area is one side multiplied by the other. An increase in both sides by 1.5x times means the area scales by 1.5*1.5=2.25, roughly 2x.
1.33x to 1.5x is close to the value of square root 2 = 1.41. sqrt(2)*sqrt(2) = 2.
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