If you go to Costco, be sure to find out how their computer works. I had a number of enlargements made for my mother. I sized them to exactly fit some frames of hers which are an odd size. I uploaded them to Costco's computer and it enlarged them all to fit their paper. They didn't have a 'print exact size' option on their computer. To get an exact size, you need to find out what size paper they will be using then put a blank border around the photo to fit.
