198 CHAPTER 5 SELECTION (Http web server) Channel masks are
198 CHAPTER 5 SELECTION Channel masks are black-and-white images (similar to the QuickMask) that represent some aspect of an image. To work with channel masks, you need the Channels dialog, usually docked as a tab between Layers and Paths (Figure 5-30). Figure 5-30. The Channels dialog Notice that there are three channels already there, for the three colors in an RGB image: Red, Green, and Blue. If your image has transparency, there will also be a channel for Alpha. Each channel has a visibility button next to it, just like layers do. Click on the eyeballs to turn off individual colors and watch what happens to the image. But you won t be using color channels now (for more on color manipulation, see Chapter 
. Instead, you ll be creating a special channel to hold the selection. Note If you view the Channels dialog when you have the QuickMask active, you ll see that the QuickMask is also a channel. To save a selection as a channel, use Edit . Save to Channel (Figure 5-31).
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