Your assumptions are correct John, with one exception:
outside the Avid world, there are instances where YCbCr is sampled as 4:4:4 as well.
One example is the NVidia SDI daughter card, and apps that rely on it(Assimilate Scratch, AutoDesk Smoke) will allow you to choose 422 or 444 when in matrixed color difference format(YCbCr)
The reason color systems got away for over 5 decades with half of the chrominance information is based on the human visual system model being less sensitive to color, and it was a pretty good assumption, just not good enough in some scenarios.
cheers,
BG
www.finale.tv
--- On Sat, 9/1/12, John Moore <bigfish@pacbell.net> wrote:
From: John Moore <bigfish@pacbell.net>
Subject: [Avid-L2] RGB vs YPbPr on Nitris component output?
To: "Avid L2" <Avid-L2@yahoogroups.com>
Date: Saturday, September 1, 2012, 6:39 PM
In playing around with a component feed PVM 20L-5 I found the component input was set different for SD vs HD. I found a menu that tells the monitor whether the input is RGB or component. That fixed my issue but got me thinking. RGB is 444 where as YUV is 422. I believe that when dealing with the Avid RGB vs YPbPr setting for the component output there is not the same difference as in the SDI world. In other words setting Avid component out to RGB or YPbPr is just a color signal difference and has nothing to do with 444 vs 422. Can someone convince me I'm right or wrong in my thought process?
John Moore
Barking Trout Productions
Studio City, CA
bigfish@pacbell.net
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