Samsung SCH-A970

I wanted to get a wallpaper on my A970, what i mean when i take a photo or just use any pic from the internet, try to use it as wallpaper it has a dark black line on top and on bottom, is there any way i can use it as full screen or as tile not just only center. on the outside lcd has a small blak line on top only. any help- please greatly apprc. ☹️