[Chris Saper]

Richard,

I think posterizing can be a very useful tool, as well. I find it is much easier for me to interpret if I posterize a gray-scaled image, as posterized color is confusing.

The caveat in posterizing is that it cannot correct value compression that already exists in the image, particularly if its origin is in film, as opposed to digital. Instead it will only accentuate any distortion in values that is already there.