In this example we have had to key out our main character from a blue screen. Actually a hastily used 'blue' sleeping bag, held aloft by crew members which then was keyed and replaced this with a dusk sky and branches
Example is taken from the feature film 'Miles Away' which is slated for a 2009 release.
www.bluntfilms.co.uk
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https://www.youtube.com/watch?v=T2xvR669e-c