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If you want to modify your work, just re-open your Duotone dialog box. To do this, go to Image, select Mode, and then choose Duotone.
Most commonly used duotone combination includes black and yellow, black and medium-blue, black and cyan, and black and brown.
Duotone are often used to make black and white images richer. Try to compare grayscale and duotone images. You will notice that color will change. Photoshop does not just add accent color; it also changes hue of all pixels.
When you go through details, you’ll find that there is only one channel, even if you’re using two colors. This is so because Photoshop uses Duotone curve. To access Curve, go to Image, select Mode, choose Duotone. The Duotone Curve button is located on left of color swatch. Click on box of ink that you want to edit.
If you want to adjust color through Photoshop’s Curve Adjustment, just select Image > Adjust > Curves. You can now change tonal value by clicking and dragging on line or by entering numbers on field.
Do not limit your combination to black and gray, use any two different colors.
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