Hello, I'm new to Photo.net. Is there a conversion for ppi to dpi? The printer I am sending my project to has requested "we recommend 100 dpi at full size" for my image resolution. If they are printing, isn't 100 dpi going to be quite grainy? And, in photoshop, I don't see an option to ensure that my photo is a certain dpi. Obviously I can control the ppi, but I don't know how to make sure my image is 100 dpi for the printer... anyone know how to do this? thanks so much!