What is 2K, 4K, 4K Ultra UHD?

In this article, we will show you what is 720p and 1080p HDTV, what is 2K Video, what is 4K Video and what is 4K Ultra HD (UHD) Video.

First, Let us view the list of common standard resolutions:
1: Full 8K Ultra High Definition (8K UHD): 8192 x 4608 resolution = 37,748,736 pixels at 16:9 aspect ratio.
2: 8K Ultra High Definition (8K UHD): 7680 x 4320 resolution = 33,177,600 pixels at 16:9 aspect ratio.
3: Full 4K Ultra High Definition (4K UHD): 4096 x 2304 resolution = 9,437,184 pixels at 16:9 aspect ratio.
4: 4K Ultra High Definition (4K UHD): 3840 x 2160 resolution = 8,294,400 pixels at 16:9 aspect ratio.
5: Full High Definition (FHD) for Blu-ray: 1920 x 1080 resolution = 2,073,600 pixels at 16:9 aspect ratio.
6: High Definition (HD) for Blu-ray: 1280 x 720 resolution = 921,600 pixels at 16:9 aspect ratio.
7: PAL/SECAM 4:3 standard: 768 x 576 resolution = 442,368 pixels at 4:3 aspect ratio.
8: NTSC 4:3 standard: 640 x 480 resolution = 307,200 pixels at 4:3 aspect ratio.
9: PAL/SECAM standard for DVD: 720 x 576 resolution = 414,720 pixels at 5:4 aspect ratio.
10: NTSC standard for DVD: 720 x 480 resolution = 345,600 pixels at 3:2 aspect ratio.
11: PAL/SECAM 16:9 standard: 1024 x 576 resolution = 589,824 pixels at 16:9 aspect ratio.
12: NTSC 16:9 standard: 854 x 480 resolution = 409,920 pixels; aka 848 x 480 resolution = 407,040 pixels at about 16:9 aspect ratio.

Note: In this web, there are some solutions for 2K, 4K, 4K Ultra UHD. Including, 2K/4K Video Editor, 2K, 4K, 4K Ultra UHD Video Converter,4K XAVC Converter and 4K Gopro Converter.

720p and 1080p HDTV
HDTV is available in both 720p(1280 x 720) and 1080p(1920 x 1080) models. The difference between them boils down to resolution, with 1080p capable of displaying a higher native resolution than 720p sets. It doesn't mean that in all instances a 1080p HDTV will display a better picture than a 720p set.

When flat-panel HDTVs first reached critical consumer mass, the format was 720p, or 720 vertical lines of resolution, at a progressive (the "P") rate of either 24 or 30 frames per second (fps) in the United States. While the US based its HD television resolutions on NTSC, Europe used PAL which meant the P in 720p is a constant 25 fps.

After flooding the market with 720p monitors during the analog-to-digital broadcast rollover, consumer electronics manufacturers decided it was time to push consumers towards "True HD" or 1080p, with its 1080 lines of vertical resolution.

2K Video
2K (2048 x 1080) has primarily been used for projection within movie theaters, which require a slightly different aspect ratio from consumer HDTVs and computer monitors. Consumer displays use a 16:9 aspect ratio, the Digital Cinema Initiative (DCI) backed by the major Hollywood studios uses a 17:9 aspect ratio that better aligns with several of 35mm and 70mm films formats used to shoot and project movies.

In fact, 2K doesn't even change the vertical resolution, leaving it at 1080 lines, and only increases the horizontal resolution to a 2048 pixel width. Run the math and you'll find that the increase from 1920 horizontal pixels to 2048 horizontal pixels is a whopping 3.43 per cent increase. Hardly worth chucking the 1080p "True HD" monitor for a 2K one.

4K Video
DCI 4K has 2160 vertical lines of resolution, which is double that of 1080p. So far so good, but what about the horizontal resolution? It clocks in at 4096 pixels. All told, that's 8,847,360 pixels, or 8.84 Mpx. DCI 4K is 4.26 times the resolution of 1080p and exactly 4 times the resolution of 2K. The difference, as we mentioned above, is the aspect ratios of 1080p (16:9) and DCI 2K / 4K (17:9).

4K Ultra HD (UHD) Video
4K UHD does double the vertical resolution, from 1080 to 2160 vertical lines of resolution, but it falls short of the 4,000 pixel horizontal resolution, clocking in at 3840 horizontal pixels. If you've noticed the pattern of doubling the horizontal resolution, you've caught on to the reason that 4K UHD isn't really 4K: 1920 times two is 3840, meaning that consumer displays will still hold the 16:9 aspect ratio.

That is all about 2K, 4K, 4K Ultra UHD.

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