what is 4K? អ្វីទៅជា4K?

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In this video I'm going to explain what 4K is in this 4K
I was kind of confused at first, so I got myself familiar with it, looked into it, and now I'm here to explain what it is and what it means to us as consumers. 4K is basically the name for the new standardized high definition resolution for displays. 4K gets its name from the amount of pixels horizontally on the resolution. It has roughly 4,000 pixels horizontally and 2,000 pixels vertically. HD displays have an aspect ratio of 16:9. Basic HD is 720p. 720p has a resolution of 1280×720 — so 1280 pixels horizontally and 720 pixels vertically.
Technically, "4K" means a horizontal resolution of 4,096 pixels. This is the resolution set forth by the Digital Cinema Initiatives. Because movies vary in aspect ratio, which refers to the exact shape of the rectangle of the screen, no vertical resolution is specified.

So yes, the pedants are correct. Ultra HD TVs aren't technically "4K" since their resolution is 3,840x2,160. However, it doesn't matter. 4K is way easier to say than 2,160p or Ultra HD,

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my Gear List
Video
canon ESO 80D
lens 50mm f1.8
audio
Video Rode Micro, Boya wirless mic WM5,
lightning
youngnu NY 300air

computer
window 10 pro, corei5 6500, AMD r7 serious graphics card, 8GB ram, 1TB hard +120GB SSD
Software
adobe premiere pro cc 2018

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