I have written a book and included several photo's. The printer would not accept and wanted all photos at 300. I have a son who works in the computer business I sent him the photos and he changed them from 72 to 300. I rentered the photos to my book. Again refused by printer. I down loaded three programs off the net to convert pixiels. I converted each photo as instructed to 300. I follow directions. I then took the photos I converted and replaced them in the book. Again they were rejected. The printer offers no help, Pixels are not an easy application. Question once I use a converter to change the pixels how do I know if it worked. I don't know if it's 72 or 300. I asked on the web and the main answer was "Photo Shop" which I don't have. I just wantt to get my book printed and I thank you for any help you can give me.