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Blue/Green screening - changing background focus


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#1 Daniel Smith

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Posted 18 October 2006 - 04:16 PM

Hi.

I know how the green/blue screen process works, keying, tracker markers e.t.c. But I noticed in a music video I watched today that the focus changed through a shot, and the false digital background also changed focus.

Is it just a case of constantly digitally matching the focus of the background with everything else? Or is there something else involved that I've missed out? Focus, marker? Just kidding.

Thanks.

Edited by Daniel Ashley-Smith, 18 October 2006 - 04:18 PM.

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#2 Scott Fritzshall

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Posted 18 October 2006 - 05:18 PM

Hi.

I know how the green/blue screen process works, keying, tracker markers e.t.c. But I noticed in a music video I watched today that the focus changed through a shot, and the false digital background also changed focus.

Is it just a case of constantly digitally matching the focus of the background with everything else? Or is there something else involved that I've missed out? Focus, marker? Just kidding.

Thanks.

It's got to be done by hand. It's probably a good idea to shoot a quick reference shot of the lens changing focus, so that the compositor can match it.
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