Mark and Kixum are correct above, but I'd add one thing to Kix's comment. 72 DPI gives you a 1 to 1 correspondence when you're viewing your image on a PC monitor. (Macs use a different DPI -- something around 90? I don't remember for sure.) At any rate there are some basics about Dots Per Inch that may help understanding here. I do a fair amount of rendering of stuff that winds up in print, so I've had to do some serious head scratching on this.... Let's say you have an image that's 4 inches by 6 inches. If you're viewing it on your monitor and it's 4 x 6 inches, it's 72 dots per inch (DPI), so it's going to be a resolution of 288 x 432 pixels. (We're assuming square pixels here; DV pixels are a different shape and so they're different in the horizontal and vertical ratio. Let's not go there for now.) Now, if you're looking at a 4 x 6 inch image that's been printed by a professional, offset post-card printing house, it's likely an image that was 300 DPI, or your render would have to be 1200 x 1800 pixels. Viewing a 4 x 6 inch 300 DPI image on your computer would make it stretch out to 16.666 inches by 25 inches, because the computer can only display 72 dots per inch. It's confusing, but if you just calculate the size you want the image to be for printing and multiply the number of inches by the DPI requested by the professional print house, you'll come up with the resolution you need to render at, regardless of the DPI setting you render at. Hope that clarified things more than made mud of them.... - Dex