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Adobe Photoshop Tutorial – Alpha Channels
Adobe Photoshop

Alpha Channels In the Photoshop tutorial, Richard Harrington takes a look at making an alpha channel based upon the luminance in an image. Alpha channels allow you to store transparency in a graphic and transfer that transparency to another non-linear video editing program or compositing application and key or composite in real time.
Tutorial, Video Tutorial 03/02/2009
Author: Richard HarringtonThis tutorial is also available as a podcast:
Click here to find it and many other Photoshop podcasts.