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Broadcast Graphics On the Spot by Richard Harrington

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Chapter 4 Channel Operations

Gaining Control Over Images Through the Channels Palette

Every Photoshop image has at least one channel that carries color information. RGB images, which are commonly used for video, have three channels: one each for the red, green, and blue color information. You can also add an alpha channel to an image, which works as a matte, determining which pixels in the image ...

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