ABOUT CHANNELS

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0 ABOUT CHANNELS

Channels are grayscale images that store different types of information:

Color information channels are created automatically when you open a new image.
The image’s color mode determines the number of color channels created. For example, an RGB image has a channel for each color (red, green, and blue) plus a composite channel used for editing the image.
Alpha channels store selections as grayscale images. You can add alpha channels to create and store masks, which let you manipulate or protect parts of an image.
Spot color channels specify additional plates for printing with spot color inks.
An image can have up to 56 channels. All new channels have the same dimensions and number of pixels as the original image.
As long as you save a file in a format supporting the image’s color mode, the color channels are preserved.
Alpha channels are preserved only when you save a file in Photoshop, PDF, PICT, Pixar, TIFF, PSB, or raw formats. DCS 2.0 format preserves only spot channels. Saving in other formats may cause channel information to be discarded.