Hmmmm. Interesting. I never tried rendering at that size before. The largest I've done with Poser 6 was 3200x2400 (96dpi). It rendered fine, but there wasn't much in the scene anyway. If you try to scale UP from the smaller rendered size, you're going to run into all kinds of resolution problems like blurring and loss of detail. I really don't know the answer for this one, but perhaps (and I mean MAYBE) you can try using the spot-render feature to get through a huge render like this piece by piece? You'd have to resort to rendering a section of the image, then another section, etc. until you have it all, then composite all the pieces carefully in an image editor. Don't know if that would actually work or not, or even if you'd be able to get through a single piece at that high a resolution, but if you really need to do it, might be worth a shot. Boy, I'm glad most of my commercial work so far has been for video, so as to avoid those massive print resolution requirements. :-( Good luck.

---

Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.