Creating Duotones
A duotone image is composed of two colors, usually black and a spot color. Such images are a great way to add visual interest to a job with a limited color palette. There are variations on this theme, such as tritones (three colors), quadtones (four colors), and so on. Since these images usually contain spot-color components, it’s important to create them correctly to ensure that they print as intended. Note that these images may be composed of all spot colors or a combination of spot colors and process colors. Start with a grayscale image, and then choose Image > Mode > Duotone (which is the starting point, even if you intend to create a tritone or quadtone image).
In creating a basic spot-plus-black duotone image, designers ...
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