Now I must state for a start that I am far from being an expert in this regard. I take a rather different view to you. I do think that gamma, contrast, white and black point, are very important in an image. If they are too far out of whack the image just looks bad, IMHO. On the other hand, I can't see the point of doing the gamma correction in Poser. What ever comes out of Poser I am going to put into a paint program, where I can play with the gamma, contrast, and other parameters at my leisure, the same as I would do with a photograph. Is there really any advantage in doing the gamma correction in Poser? I doubt it.

Quote - GC, on the other hand, seems a bit too subtle for me to notice. And if I can't see it, is it really that important?

I think there is an important distinction to be made there between what you notice and what you perceive. You might look at two images and not notice a difference in the gamma between the two, but feel that one is better than the other, and that difference in quality might be down to a difference in gamma, that whilst not noticed consciously, is still perceived on an unconscious level, and counts to how you rate the image. I very rarely use the actual gamma correction feature in a paint programme, but spend a hell of a lot of time playing with the white and black point.