DPI is a print concern. Different print media are printed at different resolution; the newspaper in San Francisco, for instance, requests that any images (digital photos, illustrations, whatever) be 162 DPI (dots per inch) with the longest dimension being 10 inches (or 1620 pixels). A glossy postcard printer we use requires that files sent to them be 300 DPI. The more dots you put on paper per inch, the higher the resolution will be. TV, on the other hand, doesn't increase the number of dots or pixels per inch as the screen size increases. (This is actually a generalization, but for purposes of this discussion, it's correct.) An NTSC image will be 640 square pixels by 480 square pixels, no matter if it's on a 4" TV hanging under your kitchen cabinet, or the 56" projection TV on which you're watching the baseball game get snowed out. If you're creating an image for film projection, you want the image resolution to be as dense as it would be if it were originated photographically. I think your later post put this at 1280 x 740 -- so you're cramming 1280 dots of information onto a piece of film that's, well, 35mm across. That's a lot of information in a really small space. You could calculate the DPI, but why bother? I've probably rambled on long enough. Hope this is helpful to someone somewhere.... - Dex