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Use Duotone mode when you’re creating a one to four-color image created from spot colors (solid ink, such as Pantone colors). You can also use Duotone mode to create monotones, tritones, and quadtones. If you’re producing a two-color job, duotones create a beautiful alternative to full color.

The Pantone Matching System (PMS) helps keep printing inks consistent from one job to the next. By assigning a numbered Pantone color, such as 485 for red, you eliminate the risk of one vendor (printer) using fire engine red and the next using orange-red for your company logo.

To create a duotone, follow these steps:

1 Choose Image ⇒ Mode ⇒ Grayscale.

2 Choose Image ⇒ Mode ⇒ Duotone.

3 In the Duotone dialog box, select Duotone from the Type drop-down list.Your choices range from monotone (one-color) up to quadtone (four-color). Black is assigned automatically as the first ink, but you can change it, if you like.

4 To assign a second ink color, click the white swatch immediately under the black swatch.The Color Picker appears, as shown in Figure 2-4.FIGURE 2-4: Click the white swatch to open the Color Picker dialog box and then click on Color Libraries.

5 Click the Color Libraries button, and then select Pantone Solid Coated as the library, it should be set by default.

6 Now comes the fun part: Type (quickly!) the Pantone or PMS number you want to access, and then click OK. (See Figure 2-5.) If you type too slowly, the incorrect number will appear.There’s no text field for you to enter the number, so don’t look for one. Just type the number while the Color Libraries dialog box is open.Try entering 300 to select PMS 300. You can already see that you’ve created a tone curve.

7 Click the Curve button to the left of the ink color to further tweak the colors.

8 Click and drag the curve to adjust the black in the shadow areas, perhaps to bring down the color overall. Then experiment with the results.FIGURE 2-5: In the Color Library dialog box, type a Pantone number in quickly, for instance 3-0-0 for PMS 300; there is no text field.

9 (Optional) If you like your duotone settings, store them by clicking the small Preset Options button to the right of the Preset drop-down list, as shown in Figure 2-6. Type a name into the Name text box, browse to a location on your computer, and then click Save. You can also use one of the presets that Adobe provides. Do this by selecting an option from the Presets drop-down menu at the top of the Duotone dialog box.Click the Preset Options button to find your saved presets.Duotone images must be saved in the Photoshop Encapsulated PostScript (EPS) format in order to support the spot colors. If you choose another format, you risk the possibility of converting colors into a build of CMYK (Cyan, Magenta, Yellow, and Black).

10 Click OK when you’re finished.

FIGURE 2-6: Save your duotone by clicking the Preset Options button.