Careful, Poser 9 does not have render gamma correction which complicates the issue.  You only get that with the Pro series.  However, you can still perform gamma, or linear workflow, by adding a few mathematical nodes to each shader.  It is tedious work to convert every single texture but it is the best alternative if you are unable to upgrade to the Pro series.  There is a Python Script available somewhere to add the nodes in the Material Room and Bagginsbill's VSSPR3 Prop has Gc already built in.

My best suggestion, read all you can about it.  Wikipedia has a good general explanation.  Understand the principles and what it involves.  The Poser Pro series has it built into the render settings, just check the box.  Regular Poser does not have this feature and everything must be converted mathematically, otherwise your scene will not look correct.  But it involves a good deal of work for it to work properly.

If this methodology does not work for you, then by all means continue with what works for you.  There are countless beautiful renders that were created before gamma correction became a household word in Poser, but those images became possible because the artists took real time to learn how the software worked for their purposes. 

Expand your horizons and have fun learning how to be creative.