Here is another link you should look into when you get the chance.  This one is a rather hot topic these days and it is getting more and more attention as time goes on and more individuals become involved with Poser and 3D programs.  Since you use Poser 7, this will be of particular interest.  It deals with gamma correction as it applies to hardware and software and should be a must read for everyone, especially individuals using Poser versions 7 and lower.

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2762503&page=1

Again, glad to help.