Steve,
I can't thank you enough. I'll change it from 1600 to 1800 now that I'm not using Winkflash. I think they said not to upload anything more than 1600 - that's why I did it.
I really appreciate your help! Awesome! Now I can upload some images to Walmart online to see if I can get the same quality prints I did before. They also use good paper. I believe it's Kodak, but don't recall.
Then I'll try mpix and Adorama and compare. I feel so good now that I know the dimensions are correct.
Liz