WHEN YOU LOOK at a document that has layers, you’re basically looking at a stack of design elements that sit on top of one another. More often than not, you start with a background layer, which is the bottom layer, and new layers are created directly on top of that. A document with multiple layers is like a giant sandwich of information, and what you see is a top-down view of all of the individual elements.

All of the layers in a Photoshop document can be controlled in the Layers panel (Figure 32.1). If you can’t see the Layers panel when you open Photoshop, go to the Window menu at the top of your screen and select Layers. ...

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