Video Asylum

Posted by DavidLD (A) on February 23, 2008 at 18:43:03

In Reply to: RE: Fun with Component video posted by DavidLD on February 23, 2008 at 14:01:18

If Py carries the information on the luma or overall brightness that could be any arbitrary number representing any point on the picture that coulld be anything from pure white to pure black. Then if we know the Pb blue chroma and pr red chroma, then the green chroma is simply any brightness that is not accounted for by the red and the blue components. A simple difference Green=Py-Pb-Pr and there is no need for a separate green component singnal.
At least I think thats how it must work.
But dont ask me how composite video works, that dumps chroma and luma into a single signal, or S video which separates the chroma from the luma but works with two not three signals. I'll leave those to the engineers here.

D