Okay, last post on the subject. I wanted to show all three versions of Ponyo together at once - film, Blu-Ray, and DVD. These film screenshots come from Studio Ghibli's press packets, and they're taken directly from the source. And remember that the Blu-Ray shots come from the trailer on the Race to Witch Mountain disc.
You'll have to view them in full size to get a fair look, so be sure to click on the photos. First photo is the film, second is the Blu-Ray, and third is the DVD.