I was having this same problem. Here is how I fixed it. I did use Wallpaper Wizardrii. But, you have to make sure you have a very high resolution image. If your image is low res, it won't work. I chose the image, then chose "crop scale". It opens with a square over your image. If you want your image to fill the screen top to bottom, keep the aspect ratio of that square when cropping. You can keep the aspect by stretching only from a corner, and not one of the sides. It's okay if you change the aspect ratio a little, but the more you do, the more you will start to see black bars on top and bottom. If you aren't worried about a little space on top and bottom, just choose scale. Depending on the aspect ratio of your image, it may fill the screen just fine. If your image is true HD, then it is 16:9 and it will have bars. But if it's closer to 4:3, just choosing "scale" should work. Just remember if it's really low res, you likely won't see the scrolling effect.
Hope this helps. If it did, hit thanks.
---------- Post added at 11:12 PM ---------- Previous post was at 10:38 PM ----------
Originally Posted by jellydroid13
Samsung's stock launcher does not support scrolling wallpapers. you need to use a third party launcher like nova or apex.
This may be true. I was using Go Launcher.