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Because when "4K" was new to the consumer market, people would ask: " What's 4K?", and usually the response was " it’s four times as many pixels as 1080p". Unfortunately most people misinterpreted this and assumed that the "4" in "4K" actually stood for "how many times 1080p" the resolution was, and since 2560×1440 is popularly known as being "twice as many pixels as 1080p" (it's 1.77 times, but close enough), some people decided to start calling it "2K", and other people heard that and repeated it. In the charts above, the naming convention is made pretty clear, though it's not without its inconsistencies. For example, every 6:5 format has a far lower horizontal pixel count than its name suggests since these formats are intended to be used with anamorphic lenses, and the images will have a wider horizontal pixel count once they are de-squeezed. There are other minor oddities like 5568×3160 being classified as 6K while 5632×2948 is classified as 5.5K, but this is somewhat expected since this naming convention does not have any "official" set of rules for determining names, it's all just convention-based. In any case, despite the occasional deviation, the main pattern of the naming convention quite clearly follows the horizontal pixel count, and definitely not "how many times 1080p". https://www.cta.tech/News/Press-Releases/2014/June/CEA-Updates-Characteristics-for-Ultra-High-Definit.aspx

resolution is a generic term for display devices or content having a horizontal resolution of approximately 2,000 pixels. [1] In the movie projection industry, Digital Cinema Initiatives is the dominant standard for 2K output and defines a 2K format with a resolution of 2048 × 1080. [2] [3] For television and consumer media, 1920 × 1080 is the most common 2K resolution, but this is normally referred to as 1080p. a b "Digital Cinema System Specification" (PDF). Digital Cinema Initiatives. 10 October 2012. Archived from the original (PDF) on 27 May 2016 . Retrieved 2 April 2015. I would say is that it seems unwise to use a chart like this to dictate your project’s resolution instead of basing it off of your acquisition specs. As an example, let’s say I’m shooting with an Ursa 12K and I want to frame for and generate a 4:3/1.33:1 master. Using this chart, I would want to set my project’s resolution to 12288 x 9216, right? Well, the problem there is that the Ursa 12K’s sensor isn’t able to acquire in that resolution. Its full frame acquisition format is 12288 x 6480, so if I set the project’s resolution to 12288 x 9216 then I would have to crop and scale the 4:3 centre of the Ursa’s sensor to fit that resolution. That doesn’t really add detail though, and it would add a ton of computational overhead and storage bloat, so it would make a lot more sense for the “12K 1.33:1” preset to be something around 8618×6480—the 1.33:1 crop from the 12288×6480 sensor. If I had to sum up what I'm trying to say, you're perfectly right in everything you say, but only as a simplification of terms for the general TV consumer, when it comes to the actual industry, and Cinema standards, saying True 4k to anyone who is in the industry or anyone who is a film fanatic will likely know that it's 4096x2160. People who think consumer TVs don't have "real 4k" are just dumb and shouldn't be even remotely compared to people in the industry who will tell you that True 4k is 4096x2160. pixels is the resolution for 8K. As for 8K UHD resolution displays, they have an aspect ratio of 16:9. All digital displays or images with a width or higher pixel value of approximately 8000 pixels have an 8K resolution. At this level of resolution, the naked human eyes will not be able to notice the individual pixels at all and the display looks very clear as no dots are visible to the eyes. Display Resolutions and Use Cases

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qHD is not to be confused with QHD. Despite having a very similar name, qHD stands for Quarter High Definition and is a display resolution of 960 x 540 pixels – one-quarter of 1080p Full HD. In digital cinema where these terms originate from, "4K" is and always has been a generic term that refers to a class of resolutions, not any one specific resolution. This idea that 4096×2160 is the "true 4K definition" used in cinema, you may notice, is only held by consumer-level internet people, not by anyone actually involved in cinema. is listed as "2.5K Full Frame", it’s safe to say if 2560×1440 were included on the list it would be classified as a 2.5K resolution as well. (You might think ''1340" is just a typo for "1440", but actually it's more likely a typo for "1350", which would make it a 256:135 (≈19:10) ratio which is consistent with the other full frame resolutions listed)

The "K" shorthand originated in the cinema industry where discussions about resolution are generally centered around a few monolithic classes of resolutions, so this shorthand was never intended to be "high precision". If used for resolutions in the PC industry, yes there will be some that are ambiguous in what they should be called. If you’re talking about an unusual resolution, then it’s best to write out the full resolution rather than using abbreviations. These shorthands don’t cover every possible resolution and they were never intended to do so. We’ve laid out what these complex-sounding screen terminologies mean in the simplest terms so that the next time you buy a device, you’ll know exactly what you’re getting. First off, let’s start with the basics.The cable selection is actually one of the major features of the Kamvas Pro 16 (2.5K) that’s missing from many similarly priced pen displays. These days when we say HD we’re talking about what gets called ‘Full HD’, a resolution which measures 1,920 x 1,080 pixels, often called 1080p. This display resolution is common on Smart TVs and many modern smartphones, PCs, laptops and monitors. Both HD resolutions here use a16:9 aspect ratio (so there are 16 pixels horizontally for each 9 vertically), which can be described as widescreen. However, on a phone 1,280 x 720 becomes 720 x 1,280 when it’s held normally. You shall make sure that the contents of works uploaded do not violate laws and regulations, contain no illegal or harmful factors of violent, pornographic and reactionary nature, or infringe any legal right of any third party. I was eager to know: did Huion make the same sort of compromises with these new Kamvas Pro displays? As you may have guessed, the answer is a resounding “no.” The Quantum Dot display in the new Kamvas Pro 16 (2.5K) covers over 95% of both the AdobeRGB (right) and DCI-P3 (left) color gamuts. As well as Laura who features on the NHS Couch to 5K podcasts, you can also be coached by celebrities, including Jo Whiley, Sarah Millican, Sanjeev Kohli and Steve Cram.