How to Create and Export an External Alpha Matte Using Adobe After Effects
Subscribe to my YouTube Channel: http://bit.ly/14uy8tq This tutorial shows you how to create and export an external alpha matte using Adobe After Effects. Topics covered include: defining what an alpha matte is, keying out a background using After Effects, the Keylight filter and a garbage matte, and how to export an external alpha matte to use in compositing.