I'm running both an iMac and a Macbook Pro, same os, both Photoshop CS5, same drivers for my Canon Pro 9000 MkII printer. My desktop will always print directly to the printer when I send an image from photoshop, regardless of file format. My laptop occasionally will print directly, but most often produces a PDF preview, which I can then print, regardless of file format. My question is: Why do they behave differently, and will the print quality from printing the PDF preview be the same as if the file were printed directly from photoshop? Thanks in advance for your help!