Thanks ELAY for that link, it's very informative - will give the software a go if I can't easily find a paper that works for me. It may be a more satifactory result in the long run to spend a couple of afternoons trying to sort it out that way than spending lots of money on various papers that may or may not suit.
As you say, I'm not tinting after conversion so the output should be monotone - that's what I thought but it's good to have it confirmed by someone more knowledgeable than myself.
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