Well, I have an HP photo printer. When I first got it I spent hours on the HP website trying to understand all of the technical aspects of printing high-resolution photographs. All I was able to glean from all of my reading was that, with my printer, 200 to 300 DPI would "probably" provide acceptable results. My printer has a special printing mode that will allow me to print at 4800x1200 (or something like that), and whenever I decide to use it I get a warning that the printing will take a long time and that the resolution needs to be 600 DPI or greater (again, or something like that) in order for me to benefit from using that mode. I have only tried to print in that mode once, and I couldn't see enough difference to worry about it. After all my studying and experimenting and research and headaches and uncertainty, I have decided that it just doesn't matter. For me, if the print looks good, that is good enough. I have decided to start using Sam's Club to print my enlargements anyway. Their prices are very good, and so far I have been pleased with their quality. And I think it's cheaper than trying to print everything at home. I don't refill cartridges, so ink prices are an issue for me. What I have decided to do is print a 4x6 print to see if I like the results, and then I go to Sam's Club to print my enlargements. I honestly think it is cheaper that way.