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Chapter 7. Using Selections, Paths, and ... > Understanding Alpha Channels and Mas...

Understanding Alpha Channels and Masks

Alpha channels are channels in the image that store transparency information in the form of masks. You can use alpha channels to show and hide particular parts of the image without erasing the image itself.

Basic Alpha Channel Creation

The easiest way to create an alpha channel to store a selection in is to make the selection first. With any selection active in the image, use the menu command Select, Save Selection to open the Save Selection dialog box (see Figure 7.18).


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