ps What does the background layer mean?
Background
The background layer is the bottom layer in the layers palette. When importing an image from a scanner or digital camera, the entire image is placed on the background layer.
Background and Background Layers
Background (in art and photography) Elements of an image may contain a foreground (A) and a background (B). The background is the part of the image that is farthest from the viewer.
Background Layer (in Photoshop) As the bottommost layer in the Layers palette, the Background layer is always locked (protected), which means You can't change its stacking order, blending mode, or opacity (unless you convert it to a regular layer).
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