Originally Posted by sneals2000
Yes - though I'm never sure about YCrCb vs RGB over HDMI - as I'm always slightly worried some devices may not be as 601 vs 709 aware as others.
I'd trust a PS3 to convert YCrCb to RGB correctly using 709 colour space or 601 colour space depending on the source. Not so sure I'd trust every display to do the same... (And as the YCrCb to RGB relationshops in 601 and 709 are significantly different, getting this wrong can skew things)
In my experience, pretty much any HD display when presented with YCbCr input will select 601 or 709 decoding based on the incoming resolution, disregarding any colorspace flags. This will yield correct results for situations where SD-based sources are output SD and HD-based sources are output in HD. (A few will allow you to select the color matrix manually, which is a nice additional feature for situations where it's messed up as I describe below)
Only in situations where SD is being scaled to HD (or HD to SD) could this cause problems if the colorspace is not twisted from 601 to 709 by the upscaling device (or 709 to 601 if you're going HD->SD). I believe that the PS3 does this when upscaling SD content. However I'm not 100% sure of this, I don't recall having tested this specifically. There certainly are some upscaling DVD or HD-disc players which do not, and this can cause problems with regular DVD, though I wouldn't fault the display for this, rather the player in my opinion.