Trish, from the blog Work In Progress Kits, posted a couple days ago about the difference in photo printing at different stores. Here is her comparison photo. I was amazed. I have had a problem with my photos I have performed actions on coming back from the printer no the same as I had sent them. Guess what!?! You can select "DO NOT auto-correct prints" before placing your photo order!
Bingo!!! I had no clue. That picture sure gives you an idea of where to get your prints processed too. I always go to Costco, but there are a couple with much more vivid colors. Hmmm...food for thought.