I am use to working with Coreldraw where I can choose a percent of the color to change the shade but not the color. I have a tshirt design that is two color, but I want various shades of one color to keep within the vendor's "two color" guidelines. I tried duotone, but that changes both of the colors I have on the design. How can I change/adjust the percentage of black (shades of gray) but not the other color (red)?
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