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Chapter 12. Channels > Ben's Techno-Babble Decoder Ring

Ben's Techno-Babble Decoder Ring

Alpha channel: Alpha channels are basically saved selections. They do not affect how your image will be printed.

Bits: In Photoshop, 256 shades of gray is known as 8 bits, while 32,767 shades is known as 16-bits. This describes how much memory Photoshop uses to keep track of all those shades. So if you find a setting in your scanning software that is called “8-bit grayscale,” it just means a normal 256-shade grayscale scan. If you hear someone say, “I have a 24-bit color image,” that means they have an image that is in RGB mode (RGB has three channels, and each channel is 8 bits: 8 + 8 + 8 = 24). Or, if you hear about a 32-bit image, that just means the image contains four channels; they are either talking about an image that is in CMYK mode (four channels) or an RGB image plus one alpha channel (for a total of four channels).


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