A layer can also be masked with a vector path. (Paths are explained in Chapter 11.) Vector masks have very precise edges, and you can edit them as a path with the Direct Selection tool. A layer (other than a Background layer) can have both a regular pixel-based layer mask and a vector mask. To show up in your artwork, pixels on that layer must be within both the layer mask and the vector mask. When a layer has both a layer mask and a vector mask, the vector mask thumbnail appears to the right in the Layers palette.
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