I've scanned in some photo sized images in photoshop using the formula - desired size divided by original size times by 2 times by lpi - in order to get the correct ppi to be able to blow up my images from photo size to A3 in QuarkXpress. Trouble is, as soon as i increase the image size in Quark the image goes all grainy. I definately scanned the original image in Photoshop at a large enough ppi, but its still happening! Any sugesstions??!