One of Photoshop's most powerful features
is the use of layers. Each layer in a Photoshop document
is a separate image which can be edited apart from any
other layer. A layer can be envisioned as an image on
a sheet of clear material. Together, all the layers
form a stack of images:
1. Layers are managed with the Layers
palette (below left). The Layers palette displays a
small thumbnail view of each layer to help identify
it. The appearance of a Photoshop document is a view
of the layer stack from the top down (below right).
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