4K resolution
This resolution is used mainly in digital cinema production, and has a total of 8,847,360 pixels with an aspect ratio 256135 (≈1910). It was standardized as the resolution of the 4K container format defined by Digital Cinema Initiatives in the Digital Cinema System Specification, and is the native resolution of all DCI-compliant 4K digital projectors and monitors. The DCI specification allows several different resolutions for the content inside the container, depending on the desired aspect ratio. The allowed resolutions are defined in SMPTE 428-1: The DCI 4K standard has twice the horizontal and vertical resolution of DCI 2K (), with four times as many pixels overall.
Da Vinci Systems
The da Vinci 2K Color Corrector, manufactured starting in 1998, was a completely revised color correction system that supported HDTV, SDTV, and 2K formats. The later system, the 2K Plus with improved color corrector tools was used on high-end DataCines and telecines like Thomson-Grass Valley's Spirit Datacine and Cintel's C-Reality & ITK Millennium. The 2K operated with a 4:2:2, 4:4:4 or 8:4:4 input in NTSC or Pal. In HDTV it operated with either 4:2:2 or 4:4:4 inputs. Many were interfaced to the Spirit DataCine.