No, don't think of it like that. Think of using the ppi to control how many pixels are in an inch of real space. So if the image is 100x100 pixels, set to 10 ppi, it would import at 10" x 10". I often set up my images this way in photoshop. I work on an image that is 24" x 36" at 150 dpi. When I import that to SU, it would be nice to have an option to keep current image size, so it actually comes in at 24" x 36" in the model. I wouldn't always want every image to do that, but the option to do it would be handy sometimes. Chris