RGB, for Red, Green and Blue, is the core color system for computer displays. The amount of colors available on a particular computer is determined by the color depth, or bit depth, of each component. 24 bit color means that you will have 16 million colors available in the RGB color space, 8 bits for red, green and blue channels. 32 bit color is actually 24 bit color plus an additional 8 bit grayscale channel, often called the “Alpha channel” and is used for masking. Higher bit depths add more bits per component, such as 10 bit, 12 bit, 16 bit and 32 bits per component. Higher bit depths are also referred to as “deep color”.