Does anyone know why dpi ratings for printers are 2 numbers? For example what does 4800 X 2400 mean? Not trying to be goofy, but does that mean the droplets are bigger one way than the other??? Wouldnt the dpi be rated off of one value? I seem to recall a time when if someone said a printers' dpi was 1200 dpi -- that it was 1200 -- and that was the only dpi value you would be given. I seen some printers now that have dpi ratings of like 9600 x 2400. What does this mean? I know there must be some logical explanation. Please help...