I took a photo of something black and used as the screen background for my Note 2, chose white font; to cut down on battery usage. I want to do the same for my new Note 4, but it only changes the home screens. My text messages, and other programs, all use light backgrounds. Can I change it to black? My battery is draining out faster than I can charge -- even with rapid charge. I thought this might help. (I've already reset the temp cache, as suggested on another thread.)