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Selections and Layers

It's almost impossible not to use multiple layers in a Photoshop document. There's very little difference between painting or editing on a background or on a layer. There is, however, a big difference in making a selection on a layer. Plus, Layers opens up three new features that are related to selections: transparency masks, layer masks, and using layers as a mask.

When reading about these new features, don't forget that masks are just channels, which are 8-bit (or 16-bit) grayscale images, just like we talked about earlier in this chapter. (Photoshop also lets you build a hard, vector-edged mask that is not based on a channel, called a layer clipping path; we'll discuss this in “Paths,” later in this chapter.)


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