8K resolution refers to an image or display resolution with a width of approximately 8,000 pixels. 8K UHD is the highest resolution defined in the Rec. 2020 standard.
An example of an 8K image generated using Blender
Astro Design 8K camera being displayed at the 2013 NAB Show
NHK and Hitachi demonstrating their 8K camera at the 2013 NAB Show
In 2018, 2001: A Space Odyssey became one of the first films to be aired in 8K resolution on television.
4K resolution is a generic term to refer to any horizontal display resolution of approximately 4,000 pixels. Several different 4K resolutions have been standardized by various organizations, including
8K resolution
…8K UHD (7680 × 4320) is the highest resolution defined in the Rec. 2020 (UHDTV) standard. 8K display resolution is the next highest standard after 4K resolution. In the early 2010s, TV manufacturers pushed to make 4K a new standard by 2017. At CES 2012, the first prototype 8K TVs were unveiled by Japanese…
Samsung UN105S9 105-inch (2,700 mm) ultra-high-definition 4K television
In full size, this image shows the difference between four subsampling schemes. The color images appear similar. The lower row shows the resolution of the color information.