I have been playing with some RGB <-> YUV (for OCR)
I't very strange to see how little information it actually in the U and V.
The top-right image is composed form just the U and V data (Y fixed at 50%)
The bottom image is just the Y data.
Also note that green has a lot of effect on Y, because our eyes are more
sensitive for green.
I have seen the red blockiness very often in jpg's as well. There was a post
about it in binary-images, I think it was an image of red pencils. It is
possible to disable sub-sampling of the red channel in jpg's (at least with
gimp) don't know if it's possible with mpg.
It often can be solved by using a less saturated red, like: <0.8,0.1,0.1>

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