I've got a shot I'd like to try as a duotone. It is digital capture, a large jpeg file. In Scott Kelby's book "The Photoshop Book for digital photographers", he talks about how to do this. Basically, you first convert the image to black and white using one of several methods. Then go to Image > Mode > Duotone, and on from there.
The problem I'm having is that I can get the image to b&w, then click Image > Mode but Duotone isn't available (I can't click on it). I'm not sure why, any ideas? Or are there other ways - I had a sepia tone in mind for this one.