VGA (Video Graphics Array) is actually a computer resolution standard. For example, VGA has a resolution of 640x480, SVGA has a resolution of 800x600, XGA has a resolution of 1024x748, and so forth. It is common to call this 15 pin D-sub connector a VGA connector, and it typically carries a RGB video signal. The red, green, and blue levels in a RGB signal are sent separately and have color values independent of each other. A big advantage of the RGB signal for HDTVs is that it allows true 1:1 direct pixel mapping, while component video signals are typically overscanned.
There are a few devices out there that will transmit/receive component (YPbPr) video signal through the 15 pin D-sub VGA interconnect. However, most 15 pin D-sub interconnects will transmit/receive only RGB video signals. RGB and component (YPbPr) video signals are unequal, and a transcoder box is needed when connecting the two together.
A component signal is capable of transmitting high definition video, and is frequently seen using the RCA interconnect. Video is transmitted in an analog format making component video lower in quality than digital formats such as DVI or HDMI. However, like RGB, it can produce an extremely high quality picture. YPbPr is the most common designator for component video with less common names of YCbCr and YUV.
Component video has three RCA interconnects with the green interconnect representing ‘Y’, the blue interconnect representing ‘Pb’, and the red interconnect representing ‘Pr’. Together, they make the YPbPr component video signal. The ‘Y’ is the luminance signal providing the black and white intensity. The ‘Pb’ and ‘Pr’ signals are then used to provide color to the image. These three signals are combined and allow more data to be transmitted in contrast to the two video signals S-video uses or the one video signal composite video uses.
Certain component video equipment have interconnects labeled YUV that in fact transmit/receive YPbPr signals. However, the YPbPr component video designator is not always compatible with YUV or YCbCr. Read your manual to make sure a YUV or YCbCr interconnect is compatible with YPbPr. Without a transcoder, component YPbPr, YCbCr, or YUV video is not compatible with the RGB video signal or any digital video signals.