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Light Wrap for keying

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How to help keyed footage and 3D renders sink into their new backgrounds.
After Effects CS3
Keying
Tips'n Tricks

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"A common visual effect is to place a person originally shot on greenscreen or bluescreen over a new background. But after you get an acceptable key, you may find that the two just don't seem to fit together. The same applies for objects created in a 3D program.

When confronted with this problem, one technique to employ is "light wrap" where the background scene subtly wraps around the edges of the foreground action, helping the two merge together just as they would in the real world. In this article on Artbeats.com, they show how to manually create this effect in Adobe After Effects, and then briefly discuss the Light Wrap plug-in in Key Correct Pro."

by Chris & Trish Meyer of Crish Design (www.cybmotion.com)
(Keyed footage courtesy of Photron, creators of the Primatte keyer)

The main trick is to duplicate your keyed footage and then take your foreground element and apply a blur to it. Use this blurred version as an inverted alpha matte for the copy of the original foreground...

Keywords

Light Wrap, Keying

(Min. Version: After Effects CS3, Category: Keying, Type: Tips'n Tricks)
posted by Dan Johansson on Aug 14, 2009

 

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