4K resolution
4K resolution, also called 4K, refers to a horizontal display resolution of approximately 4,000 pixels. Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 38402160 (4K UHD) is the dominant 4K standard, whereas the movie projection industry uses 40962160 (DCI 4K).
Red Digital Cinema
The early team members engaged in undisclosed research on how to make a digital camera feasible for Hollywood productions. Part of this involved using 4K resolution instead of 2K which was most common at the time. Another technical hurdle was to achieve the focusing quality of DSLR cameras without sacrificing frame rate. Part of Red's solution to this problem was developing a sensor with a physical size comparable to that of analog film. At the 2006 NAB Show, Jannard announced that Red would build a 4K digital cinema camera, called the Red One, and began taking pre-orders.