DPI only comes into play when you print. As far as bitmaps (your rendered output) goes, 1200x1600 is 1200x1600. Setting the DPI in Carrara only adds that number to the output file's header info, for the purposes of displaying the right size in WYSIWYG layout programs like Quark, and for setting printing dimensions. The DPI setting in Carrara has no effect on the rendering results in any way. -Adam