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’re looking at it backwards. The 80 and 120 values you’ve pointed out are not causes, but effects. “[HDTV](https://en.wikipedia.org/wiki/High-definition_television)” defines a set of acceptable formats including 720p, 1080i, and 1080p, and a widescreen ratio (the relationship between the image’s height and width) of 16:9. 80 and 120 have no meaning beyond the simple mathematical relationship between the aspect ratio and the specified resolution.
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