Photoshop for Video: Calculations
A CreativeCOW Photoshop Video Tutorial
Washington, District of Columbia USA
©2007 Richard Harrington and Creativecow.net. All rights reserved.
In this Photoshop tutorial you will learn how to extract an image from its background using a method called "calculations". This method allows you to create a new channel based on the information of your existing channels. When you find the two highest contract channels and then combined them together to form a new channel, you can use that channel as your alpha channel.
This tutorial is also available as a podcast:
Click here to find it and many other Photoshop podcasts.