| There is that, but my point was more the bandwidth increase along the cable by splitting off the signal into Luminance, Red and Blue (and not needing to send the green, since it can be inferred from the other 2...) you only need to use up 2/3 of the cable bandwidth for colour, meaning there is more available for HD signalling. That's how I understand it anyway, but I may well do some more research before updating the article.
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