Visque,In case you saw the last posting from me I deleted it because I was wrong in my explanation.What I am trying to explain(and I,m confusing myself here.I,ve had to go away and recheck,hence this revised answer.) is the difference between screen size and print size.You are correct in what you say,but if you were to require an image to be printed at say 9" x 12" and the magazine wanted a 300dpi image (the dpi of the original image has an effect on the quality of the printed end result,because of the amount of information it contains)then your 72dpi render would have to be 2,300 x 3,600 pixels big.This is the same amount as a 300dpi 9" x 12" image.The printed size would be the same it,s just the screen size seems outragous.But your correct there is no interpolation if you can plan ahead for your final output.