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Chapter 8. Understanding Colors and Chan... > Understanding the Duotone Color Mode

Understanding the Duotone Color Mode

The duotone color mode, converts a grayscale image into duotone (2-color), tritone (3-color), and quadtone (4-color) image using 2 to 4 custom inks. Duotones are frequently used to increase the tonal depth of a grayscale image. For example, most printing presses produce 50 levels of gray per color. By converting an image into a duotone, and using black and a mid gray, the press can produce a grayscale image with more dynamic range. A more common method for employing the duotone color mode is to create an image with an overall colorcast. For example, converting the grays in the image to sepia tone. If you're uncertain how to create the proper color mix for a duotone image, Photoshop comes equipped with dozens of sample duotone color values.


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