Volumetric lighting effects, such as light rays and glows, are
susceptible to two common problems: They can look too synthetic, and
they are prone to banding when compressed for DVDs and the web. In
After Effects Natural Light Effects,Chris Meyer shows how to make
light look more realistic by adding dust or swirling smoke, creating
natural imperfections that help with compression. He demonstrates how
to do this using stock footage of this natural phenomenon or the
After Effects Fractal Noise and Turbulent Noise effects.

http://www.lynda.com/home/DisplayCourse.aspx?lpk2=46830

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