I thought it was just a print decission: you've got a negative and then you decide how to print it, as you decide the contrast, the shadows, the lights, ...
So, if I've got a negative (say normal negative, normal contrast, correct expossure, ...) and I want to "simulate" high/low key situation, what should I do? How can I print it to get it (simulate) as a hight key print?
Burn and dodge, a lot.
If you can reshoot you may (will probably) be better off.
Mark Barendt, Beaverton, OR
"We do not see things the way they are. We see things the way we are." Anaïs Nin