#Image Printing
Kevin's got the answer for you. Multiply the number of inches by the dpi to get
the pixels (e.g., 6×300 = 1800, 5×300 = 1500 for 1800×1500 pixels). The result
for hardcopy will usually be larger than your display, so either render with No
Display, or use the Null driver, and use a 1.0 aspect ratio for hardcopy so the
pixels are square.
– J