But that is the probleme of Poser 7 to save the images with such a low quality. With Poser6 I can save in much better quality. A point why I still prefere Poser6 for closeup renders. 
I really wonder why I can set the resoluton to 300 or more, if I only can have 72 at the end? That´s nonsense, isn´t it?
I´m still not a fan of Poser7.