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Chapter 7. Color Theory and Practice > Photoshop's Other Color Modes

Photoshop's Other Color Modes

Photoshop enables you to work in six color modes in addition to RGB and CMYK. Each of the color modes has specific characteristics and can be used for specific purposes.

Grayscale

Often referred to (incorrectly) as “black and white,” this color mode offers 256 shades of gray, including black and white. Grayscale mode uses one color channel. Although Grayscale is an 8-bit color mode (with 256 shades of gray), Photoshop measures each pixel's color as a percentage of black. Grayscale can be used in commercial printing, on the Web, or for output to other devices, such as inkjet printers and film recorders. Photoshop also permits you to work with 16-bit grayscale images (see “A Note on Color Bit Depth”later in this chapter).


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