Basically if you want a more real look and for it to look right on your comp without post work, gamma correction helps a lot.  However if you'd prefer a more stylistic approach, then you don't need it.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)