Locking wallpaper so it won't rotate?

On my iPad, I have set a wallpaper that fits perfectly in portrait view, but when flipped to landscape view, the wallpaper will zoom in on the center of the image and crop most of the image. It's kind of annoying so is there a way to lock the wallpaper so it won't rotate while I change it to landscape view? I have tried setting the image manually so when I rotate the iPad, the wallpaper would look better in landscape, but that changes the portrait view as well.