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looks like u r right. currently there are no PS3 game supports xvYCC but future games might support. Blu-ray by definition doesn't support xvYCC.
But it seems like if your AVCHD video has wide gamut, then it might be able to make a difference.
http://ae.playstation.com/ps3/suppo...st-Y-Pb-Cb-Pr-Cr-Super-White-(HDMI)-settings/