Definition: Photoshop uses the term Channels to describes black and white and colour image data. In Photoshop, one channel id typically defined as having up to eight bits of grayscale image information. Continuous tone images created with a scanner use channels as a way to describe the black and white and colour image data. A black and white grayscale image has one channel. An RGB colour image has three channels. A CMYK colour image has four channels. It is possible to have up to 24 channels in photoshop.
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