AVS Special Member
Join Date: May 2008
Location: San Francisco - East Bay area
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If there is no obvious difference between YCbCr modes and RGB modes, YCbCr 4:2:2 is the best mode to use... period. It delivers 12-bit video while the other options are all limited to 8 bits (discussed in other forum threads and is NOT what most people THINK happens -- most people think all format options are 8-bits unless you enable a higher-bit mode in the player... but that's not true). Even Lumagen, makers of the best video processors available in the consumer market, recommend 4:2:2 unless there is a compelling reason to use some other mode (like RGB looks better with some specific video displays).
In my experience, about 60% of the time, every mode looks identical. Somewhere around 5%-10% of the time, RGB looks better (video display determines this) and the remainder of the time YCbCr looks better. So you have a 90-95% chance of YCbCr 4:2:2 being the best option.
"Movies is magic..." Van Dyke Parks
THX Certified Professional Video Calibration
Widescreen Review -- Home Theater & Sound