Quick links to procedures on this page:
Converting images to the duotone color mode
Duotone color mode is used for specialized color printing. A duotone image is a grayscale image that has been enhanced with the addition of one to four colored inks. The following list describes the duotone types:
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duotone — a grayscale image colored with two inks. In most cases, the first ink is black and the other ink is colored.
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tritone — a grayscale image colored with three inks. In most cases, the first ink is black and the second and third inks are colored.
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quadtone — a grayscale image colored with four inks. In most cases, the first ink is black and the second, third, and fourth inks are colored.
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Adjusting tone curves
When you convert an image to the duotone color mode, a tone curve grid that represents the dynamic ink curves that are used throughout the conversion is displayed. The horizontal plane (x-axis) displays the 256 possible shades of gray in a grayscale image (0 is black; 255 is white). The vertical plane (y-axis) indicates the intensity of an ink (from 0 to 100 percent) that is applied to the corresponding grayscale values.
Saving and loading inks for duotone conversion
After you choose a duotone type and adjust the tone curves for the inks used to change images to the duotone color mode, you can save the ink settings and load them for use with other images.
Specifying how overprint colors display
When you change an image to the duotone color mode, you can specify which colors will overprint when you print an image. Overprint colors are the colors that have too much ink when two or more colors overlap. When you display the image, each color is applied on the screen in sequence, creating a layered effect.
You can view all instances in which the ink colors you choose overlap. Associated with each instance is the color that is produced by the overlap. You can also choose new overprint colors to see how they overlap.
To convert an image to the duotone color mode |  |
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Click a duotone type from the Type list box.
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If you want to adjust the color’s tone curve, click the ink tone curve on the grid to create a node, and drag the node to adjust the amount of color at that point on the grid.
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You can load ink settings by clicking the Curves tab, clicking Load, locating the file where the ink settings are stored, and double-clicking the filename.
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To specify how overprint colors display | |
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In the Select color dialog box, choose a color model from the Model list box, click a color, and click OK.
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