Adobe INDESIGN 2.0 - USING HELP Help Manual page 262

Adobe InDesign Help
Using Help | Contents
An alpha channel is an invisible channel that defines transparent areas of a graphic. It's
stored inside a graphic with the RGB or CMYK channels. Alpha channels are commonly
used in video-effects applications. You can create alpha channels using background-
removal features in Adobe Photoshop, such as layer masks, the Channels palette, the
background eraser, or the magic eraser.
A B
D E
A. Original graphic B. Alpha channel C. Placed graphic
D. Original graphic E. Graphic with embedded path F. Placed graphic
Using clipping paths to remove backgrounds from imported
graphics
If you import a graphic saved in EPS, TIFF, or Photoshop format, and the graphic already
contains a clipping path or an alpha channel, simply place it, and InDesign will use the
path or channel automatically. When an imported graphic includes more than one
embedded path or alpha channel, you can choose which path or alpha channel to use in
making a clipping path. This gives you maximum flexibility in creating transparent
backgrounds for imported graphics.
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