Seems that poser 12 is clearly broken compared to all the previous versions when it comes to DPI. all previous versions work well and clearly render at the DPI setting not reducing it . You will note this when reducing an image rendered at 300-600 dpi in Poser 11 and reducing it for Web at 72 Dpi that it will loose quiet allot of quality and not be as sharp. Actually it is not the Idea having such an Option in Poser 12 expecting it to work and having to calculate a Increased size to achieve the effective DPI you want to end up with.

Seems Poser 12 will remain for some more years in Pre Release not even the Poser 11.1 SM to Bondware's 11.3 version has ever been finished before the support stopped it just has been dropped with a broken Python engine that needs to be run with a 3rd party fix ! Not a very serious marketing strategy.