To get the dpi of my rendered scene, I rendered a scene, saved it and right clicked my saved image and click properties, then sumary, it says 96dpi veritcal resolution and 96dpi horizontal resolution. That is with a 6000x9000 render from terragen. So I wonder, if I render a scene at 6000x9000 and bring it to a photo place to have it made poster size, will they say it will has a high enough dpi to get a clear picture, or is there a way to change the actual resolution in terragen?