The name 4K resolution refers to a horizontal resolution of approximately 4,000 pixels. The use of width to characterize the general resolution marks a switch from previous television standards such as 480i and 1080p, which categorize media according to its vertical dimension. Using that same convention, 4K UHD would be named 2160p
There are two main resolution standards:
The DCI 4K resolution standard, which has a resolution of 4096 × 2160 pixels (256:135, approximately a 1.9:1 aspect ratio). This standard is widely respected by the film and video production industry. The standard has twice the horizontal and vertical resolution of DCI 2K.
UHD-1, or ultra-high-definition television (UHDTV), is the 4K standard for television and computer monitors. UHD-1 is also called 2160p since it has twice the horizontal and vertical resolution of 1080p. It has a resolution of 3840 × 2160 (16:9, or approximately a 1.78:1 aspect ratio). UHD-1 is used in consumer television and other media, e.g. video games.
4K and UHD are basically interchangeable at the commercial level, they do actually also mean slightly different things. While most UHD that you’ll find on TV screens is actually 3,840 pixels as mentioned above, it still gets called 4K because it does after all offer 4 times the resolution profile of regular HD.
However, in a more specialized context, proper 4K is what is most often found as a digital camera resolution standard that involves an actual 4,096 x 2160 pixel resolution at an aspect ratio of 1.9:1 (horizontal: vertical) as opposed to common TV based 3,840p width and aspect ratios of 16:9 or 1.78:1.
Basically, regardless of the fact that 4K TV is officially defined as UHD, you’re buying into the same thing, weather it is used to describe a TV, monitor or film/Photo camera.
More pixels, better video?
More pixels means more information. More information means sharper pictures. Sharper pictures are more engaging. With more pixels you can more detailed videos with sharper colors and more contrast. More engaging content is more fun.
Recordings with an action camera are just amazing and beautiful. You can make pictures or videos of great quality and can capture all of your great adrenaline or non-adrenaline moments in great detail and share them with your friends and family.