4K resolution, also called 4K, refers to a horizontal resolution on the order of 4,000 pixels and vertical resolution on the order of 2,000 pixels. Several 4K resolutions exist in the fields of digital television and digital cinematography.What is the actual resolution of 4K?
A UHD or 4K display is one with at least 8 million active pixels. For televisions, that resolution has standardized to 3,840 by 2,160. Digital cinema 4K (the resolution in 4K movie theaters) is slightly higher at 4,096 by 2,160.Is retina better than 4K resolution?
Retina displays have little to do with the resolution. It’s just a resolution where at eye level you won’t see any pixels, while 4k TVs (really UltraHD, because they’re 2160p tvs not 4k tvs), can show pixels if the TV is large enough.