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Chapter 9. Channels > Three Varieties of Channels

Three Varieties of Channels

There are three varieties of channels: color channels, spot channels, and alpha channels (Figure 9.1). They all look about the same, but they perform completely different tasks. However, they do have some things in common: they have the same dimensions as the document that contains them; they can contain up to 256 shades of gray; and Photoshop treats them as if they were individual grayscale documents. Let's take a surface look at them; then we'll explore each one in depth.

Figure 9.1. Channel types.



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