The Photoshop CS2 Book for Digital Photographers Fake Duotone 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 (and if you're up for that chore, turn to Chapter 7 and you can give it a whirl). 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). Step One: 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, so you can just treat this like any other