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I wanted to hook my old DVD player (Toshiba 3950) to the new Panasonic 32 inch flat panel via component video. All I had was a standard red/white/yello audio/ composite video cable I had picked up at the dollar store. So, I decided to make Py = Yellow, Pr = Red and Pb=white. I plugged it in.
Oddly, the DVD picture appears to be absolutely perfect using this cheap cable. I can see no artifacts whatsoever. I wouldn’t do this for a longer run but I did think that this was interesting. If there are any artifacts I should be looking for let me know.
Fun with Component video.
Component video separates the color signal into the three component colors (chroma) as well as the brightness (luma)
Py contains the brightness information and also the information needed to do the green component. If Py is disconnected, the screen will be entirely black. Interestingly, with only Py, the result is a black & white not a green and white picture.
Pb contains the information needed for the blue component. If Py and Pr are connected but Pb is disconnected, flesh tones turn magenta, and the blue sky turns cyan (blue-green) Tan colors will tend toward magenta.
Pr contains the information for the red component. If Py and Pb are connected, but Pr is disconnected, the sky turns purple and faces take on a sickly greenish cast
Swapping Pb and Pr leads to a really strange situation. Faces and flesh tones turn blue, and the sky turns a Martian orange-red
Follow Ups:
cable.
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
"Swapping Pb and Pr leads to a really strange situation. Faces and flesh tones turn blue, and the sky turns a Martian orange-red"
Makes every ensemble into Blue Man Group.
Kal
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