What would cause my launch screen image to be black for the few first seconds on iOS?

I have a launch screen image set for iPhones and iPads. When my iPad starts, it shows the launch screen with its white background, but my launch screen image is initially a black box for a couple of seconds, before properly showing the image. Here are the launch screen image's import settings (sorry for the link, the image upload isn't working): http://i.imgur.com/PW7tMb4.png What would cause this behavior? Thank you.