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Photoshop's Duotones

There are two ways to create multitone images in Photoshop: Switch from Grayscale to Duotone under the Mode submenu, or create them in CMYK mode. We're focusing our discussion on the Duotone mode, and will cover CMYK mode later in this chapter.

In every other color mode in Photoshop, the color is made of multiple channels—CMYK color is made of four channels, RGB is made of three. Multitones are different. In a multitone image, Photoshop saves a single gray-scale image along with two curves—one for each color plate. These curves are just like those in the Curves or Transfer Function dialog boxes (see Figure 11-6). Note that you can only create a duotone from a grayscale image. (If you've got a color image, see “The Color of Grayscale” in Chapter 15, Essential Image Techniques)


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