Video Asylum

Posted by jbmcb (A) on February 28, 2005 at 08:19:48

In Reply to: RGB vs Component Video posted by afrob@mweb.co.za on February 27, 2005 at 12:41:22:

In RGB the signal is split into seperate red/green/blue levels, with the sync signal integrated into the green channel.

More advaned is RGB+S, which seperates out the sync signal on it's own channel. Still more advanced is RGB+HV, which seperates out horizontal and vertical sync, often used in very large format projectors, and is also what is in analog computer VGA cables.

Component video doesn't use RGB level information. It has a composite black-and-white signal, Y, and two differential signals; Yb which is the difference between black-and-white and the blue signal, and Yr, which is the difference between black-and-white and the red signal. Green is then computed from the three signals.

The MPEG2 stream in DVD's is encoded in this Y/Yb/Yr colorspace. When you output component video from your DVD player, you are getting the exact output of the MPEG2 decoding process.

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