Here’s another little PDF which looks at creating a Duotone in Photoshop. It’s an easy technique, but one which has enormous scope for creating tinted effects in your images. Getting control of the duotone curves to edit the tones of the inks you use can take a bit of time and experimentation, but the results are rewarding.
This PDF is another extract from a couple of ebooks which are currently in production. Hope it proves useful, and I would be happy to hear feedback on it.