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About channels

In this lesson, you’ll use three types of channels. You’ll learn to mix color channels to improve the quality of an image. You’ll select areas of the image by loading a selection from an alpha channel. And you’ll use a spot color channel to add a second color to the image.

A color channel in Photoshop stores information for a particular color used in an image; all channels combined form the hues and tones of a complete image. For example, a CMYK image has four color channels: cyan, magenta, yellow, and black. In this lesson, you’ll work with the three channels of an RGB image, as well as spot color channels, which let you specify additional color separations for printing an image with spot color inks. A third type of channel, an alpha channel, stores masks or selections of an image for later use; alpha channels do not print.


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