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Chroma sub-sampling preview

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Nathan Grout
Chroma sub-sampling preview
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?

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Walter Soyka
Re: Chroma sub-sampling preview
on Jun 28, 2013 at 1:54:25 pm

Not directly.

If you're using CS4 or CS5/CS5.5, you can use qp_ChromaSubsample [link].

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.

Walter Soyka
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