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Have you ever looked at a stunning photo book of black and white images and wondered how the photographr achieved such a density and richness of tonal values. Chances are those black and white images weren't black and white at all but were dual tones tri tones or quad tones. In Photoshop terminology duotone is an umbrella term for printing a grayscale image in one two three or four color inks. Monotone duotone tritone and quadtone are each variant of the duotone color mode.
By printing in up to four colors, each with a different tonal range, you can allocate specific colors to specific parts of the tonal range. You can use dual tones for a sepia or color tinted look, or to achieve a richer denser black and white. You can customize your own duotones, tri-tones, and quad-tones, choosing whichever colors you want and adjusting the tonal values of those colors. But a good place to start is simply by using one of the presets that ship with PhotoShop.
Note that images converted to the duotone mode must be saved in the native Photoshop or psd file format.
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