2 Replies Latest reply on Apr 9, 2015 4:24 AM by black_zion

    4K vs. UHD: What's the difference?



      The simplest way of defining the difference between 4K and UHD is this: 4K is a professional production and cinema standard, while UHD is a consumer display and broadcast standard. To discover how they became so confused, let’s look at the history of the two terms.

      The term “4K” originally derives from the Digital Cinema Initiatives (DCI), a consortium of motion picture studios that standardized a spec for the production and digital projection of 4K content. In this case, 4K is 4,096 by 2,160, and is exactly four times the previous standard for digital editing and projection (2K, or 2,048 by 1,080). 4K refers to the fact that the horizontal pixel count (4,096) is roughly four thousand. The 4K standard is not just a resolution, either: It also defines how 4K content is encoded. A DCI 4K stream is compressed using JPEG2000, can have a bitrate of up to 250Mbps, and employs 12-bit 4:4:4 color depth. (See: How digital technology is reinventing cinema.)

      Ultra High Definition, or UHD for short, is the next step up from what’s called full HD, the official name for the display resolution of 1,920 by 1,080. UHD quadruples that resolution to 3,840 by 2,160. It’s not the same as the 4K resolution made above — and yet almost every TV or monitor you see advertised as 4K is actually UHD. Sure, there are some panels out there that are 4,096 by 2,160, which adds up to an aspect ratio of 1.9:1. But the vast majority are 3,840 by 2,160, for a 1.78:1 aspect ratio. ""



        • 4K vs. UHD: What's the difference?

          I don't think this distinction is going to matter much to people. 

          A great many keep misuing the suffix "p" for any common monitor resolution (e.g. saying "1440p" for 2560x1440, or "2160p" for 3840x2160).  It correctly denotes progressive-scan television resolutions, and once you get beyond standard definition, the only two valid "p" resolutions are 720p and 1080p.  Which are both different from non-TV signals with the same resolution (i.e. 1280x720 over DVI or VGA is not the same display mode as 720p).


          • 4K vs. UHD: What's the difference?
            Well, 3840x2160 is exactly 4x 1920x1080, 8,294,400 pixels, but really buying a 4K TV right now just because it is 4K when the television stations only broadcast in 1080i or 720p is a waste of money. That being said UHD TVs are a good buy if you have to replace a main TV as they are, in some cases, even cheaper than FHD models from the same manufacturer, and the upscaler in quality models does make a difference, not to mention the LED backlighting means the TV consumes far less power and produces less heat than a CCFL backlit one. I do wish they would be required to stop calling them 4K displays, instead call them 4X UHD, but as far as a television broadcast goes if the standard is UHD 3840x2160, it doesn't matter if you watch it on a UHD or true 4K panel, it's going to have to be displayed at 3840x2160 to prevent distortion, which means black bars on a true 4K display.