The duotone tinting look is all the rage right now, but creating a real two-color duotone, complete with curves, that will separate in just two colors on press is a bit of a chore. However, if you’re outputting to an inkjet printer, or to a printing press as a full-color job, then you don’t need all that complicated stuff—you can create a fake duotone that looks at least as good (if not better).
Open the color RGB photo that you want to convert into a duotone (again, I’m calling it a duotone, but we’re going to stay in RGB mode the whole time). Now, the hard part of this is choosing which color to make your duotone. I always see other people’s duotones, and think, “Yeah, that’s the color I want!” but when I go to the Foreground ...