4k UltraHD standard is a synonym of amazing definition in images. But if you wonder what 4k exactly is, I am here to help you.
4k UltraHD displays have a resolution of is 3840 x 2160 pixels or 2160 p. If you think at the monitor as a grid, this resolution means that this grid will be composed of 3840 columns and 2160 rows. Each cell of this grid is a pixel. The total amount of pixels is this 3840 x 2160 = 8,294,400. The aspect ratio of this resolution is 16:9.
So where is the difference between 4k UltraHD and Full HD. Well the answer is in the size of the grid, i.e. the resolution. The Full HD standard means a resolution of 1920×1080 pixels. The multiplication brings up to a 4 times less amount of pixel than the 4k Standard.
Another question: from where does the name 4k come from? The name comes from the width of the resolution grid, which is about 4,000 pixels (3,480). So the 4k consumer televisions are actually not reaching the real amount of pixels in width, that’s the reason why they are often followed by the term Ultra HD.
In movie theaters, this is not the case. screens have a resolution of 4096 x 2160. That is a real 4k standard. It’s used as a standard resolution in all the movie theaters, defined by the Digital Cinema Initiatives in the Digital Cinema System Specification.