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Choose Image ⇒ Mode to view the available image mode choices. Selecting the right mode for an image is important because each one offers different capabilities and results. For example, if you choose Bitmap mode, you can work only in black and white. That’s it — no shades of color, not even gray. Most features are disabled in Bitmap mode, which is fine if you’re working on art for a black-and-white logo, but not for most images. If, instead, you work in RGB (Red, Green, Blue) mode, you have full access to Photoshop’s capabilities.

Read on to see which image mode is best for your needs. When you’re ready to make your mode selection, open a file and choose Image ⇒ Mode to make a selection. You can read descriptions of each image mode in the following sections.

Keep in mind, if you are not sure which mode will work best, stay in the RGB mode. The RGB mode offers access to most all of Photoshop’s features and can easily be changed to a different mode later.

A channel simply contains the color information in an image. The number of default color channels in an image depends on its color mode. For example, a CMYK image has at least four channels — one each for cyan, magenta, yellow, and black information. Grayscale has one channel. If you understand the printing process, think of each channel representing a plate (color) that, when combined, creates the final image.