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Keying - those painful DSLR edges :(

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Elliot FrahsKeying - those painful DSLR edges :(
by on Jan 23, 2014 at 7:44:24 pm

Dear Abbey,

Why do my edges look like this? Why does the shooter hate me?

To be serious, we all know of the limitations of compressed color sampling (although a detailed explanation of this example would be appreciated.) The question is, what mix of techniques do you all use with keylight or other effects (extract?) to get the best out of this type of edge? What do you do in production to mitigate this?

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Joseph W. BourkeRe: Keying - those painful DSLR edges :(
by on Jan 24, 2014 at 1:15:02 pm

Here's a good discussion of this issue:

It all boils down to the amount of information in the chroma sampling. Here's a good snapshot of what's going on:

And a nice little pocket education on the how's of shooting for a chroma-key:

In production, you use the camera with the highest chroma sampling rate you can get - minimum 4:2:2. Otherwise, it can be done (anything can be done), but at the cost of time in post-production.

Joe Bourke
Owner/Creative Director
Bourke Media

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Stephen SmithRe: Keying - those painful DSLR edges :(
by on Jan 27, 2014 at 6:45:45 pm

I add about .5 to the feather and I think it helps.

Stephen Smith

Utah Video Productions

Check out my Motion Training DVD

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