INTERESTING. I had no idea.
I agree with the remark (on that page) that it's probably due to their compensating for the 3D experience (one commenter said that when you watch it in a theater you're effectively wearing sunglasses).
So sad that I'd now wish I'd waited a year and bought the 3D version.
Shifting films, is it true that The Little Mermaid will be in 3D next fall? I'm so hoping for its Blu-ray.