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previous section, “Layer Masks 101: How They Work,” as shown in Figure 49-5. If you click the layer mask channel in the Channels palette, it’s displayed in the image window.
Figure 49-5: Under the hood, a layer mask is really a grayscale channel.
Because the layer mask is a channel, it gives you all the flexibility of a channel. You can use the channel to create a mask-shaped selection, you can edit the layer mask to reshape it, and you can view the layer mask either by itself in the image window (where it appears in grayscale) or as a colored overlay superimposed on the image. (To find out more about channels and what they’re capable of, turn to Technique 52.)
