Keep in mind that you don't need Poser Pro to do render Gamma correction; it can be done in Poser 5; it's just a bit more work.  One way is to Gamma correct the shaders...

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2738989&page=1

The other is to use the Artistic Lens to apply it (about the 4th post from the bottom for the node setup)...

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2754029&page=1

The first is more accurate, but the latter is easier...

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