I am using a Fuji FinePix 9100 with the photo size set on 3488 x 2616 (what they call 9M F). I have also shot in RAW converting the image to Jpeg. When I upload to have pirnts made at onine services like Costco and Adorama I am informed that the largest that they can print and have the prints look good is 8 x 10. I am informed that the pictures are of a low resolution. In converting the RAW to jpeg I set the resolution to 500 and still got the same result when uploading the files. How does one get the higher resolution photos to be able to print in 12 x 18 and 16 x 20? I have a friend who shoots with a Nikon D300 and his 16 x 20 prints look great.