The following text replaces the sidebar, “About the Background layer,” on page 94 in the printed book.
About the background layer
When you create a new image with a white or colored background, the bottom layer in the Layers panel is named Background. An image can have only one background layer. You cannot change the stacking order of a background layer, its blending mode, or its opacity. You can, however, convert a background layer to a regular layer.
When you create a new image with transparent content, the image doesn’t have a back-ground layer. The bottom layer isn’t constrained like the background layer; you can move it anywhere in the Layers panel, and change its opacity and blending mode.
To convert a background ...
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