Light wrap

From Mographwiki.net

Light Wrap, also known as light spill, is an effect that is commonly used when greenscreening for compositing images to their backgrounds more effectively. Because all objects absorb, and to some extent reflect the light around them, it is important to ensure that your composited piece fits in with the background. For example, if a light is flashing to the left of your object, you would like your object to respond at least somewhat appropriately as well. There are many ways to lightwrap. Some cover the color, some just cover brightness, and some are full fledged plugins with many properties.

To create a general light wrap, take your background layer, and blur it. Take your Alpha matte, and inverse it. Then grow the alpha matte by an appropriate amount (more for metal, less for organics), and soften it. Then use your original alpha layer as a clipping mask for the new blurred alpha matte. Lower your opacity, and apply a blending mode as necessary. What this effectively does is adds the background to your foreground and blurs it.

Common Plugins include: Digital Film Tools: Composite Suite Light Wrap WalkerFX: Light Wrap Maltaannon: CE-LightWrap Boris Continum Complete: BCC LightWrap Genart Sapphire: Edge Flash Trapcode: Shine