Chroma sub-sampling preview
by Nathan Grout on Jun 27, 2013 at 10:07:08 pm
I'm doing some graphics work that involves contrasting colors separated by sharp edges. When these edges are curves or diagonals, they look more pixelated when rendered to 4:2:2 than when rendered to 4:4:4, or even within After Effects itself. This makes sense as an artifact of the chroma subsampling used. Here's my question: is there a way to preview video in After Effects that takes chroma subsampling into consideration? Is there a way to set After Effects to a 4:2:2 preview mode?
CS6 and higher (or CS3 and lower), you have to make your own. You can get a decent approximation by adding an adjustment layer with the following effects:
Channel Combiner (set to RGB to YUV)
Channel Blur (Red:0, Green:2, Blue:2)
Channel Combiner (set to YUV to RGB)
I recommend making this adjustment layer into a guide layer so you don't accidentally render it.
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