iOS 7 Picture not filling screen in Camera Roll

I recently updated to the iOS 7 on my iPhone 5. I went to check out the camera roll to view my photos, and I noticed when I have a photo up, there's two black horizontal bars, one at the top and one at the bottom of my photo. Previously on iOS6, the picture would fill up the whole screen instead of having this small picture like I do now.

Anyone know the best way to go about fixing this?