Component video splits the video signals into three cables — green, blue and red — with each transmitting a specific component of the video signal. The green cable (also called Y) transmits the brightness information of the signal. The blue and red cables (called Pb and Pr, respectively) transmit the blue and red components of the picture’s color. Green components are inferred by a combination of all three signals. Since component video is spread across three separate cables, it does not need to be as compressed as composite video, allowing support for HD resolutions as high as 1080, as well as progressive scan images that create smoother images with more defined edges.
Component cables initially replaced composite as the de facto analog video cable, thanks to its improved picture quality and HD support. Nearly all HDTVs made today have at least one set of component inputs. Component video is also supported by most video game consoles, DVD players, digital video recorders, cable set-top boxes and Blu-ray players.