By Jacci Howard Bear, About.com Guide
Top: Choosing Alpha Channel in Adobe InDesign; Bottom: Choosing Alpha Channel in QuarkXPress.
You use an alpha channel as a clipping path in much the same way as described in Placing Images With Embedded Paths.
However, when your image contains multiple alpha channels there's an extra step involved. Choose the channel you want from the drop down box in the Clipping Path options of Adobe InDesign (top dialog in illustration) or QuarkXPress (bottom dialog in illustration).
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