Wallpaper placement on Lollipop update ?

Hello,

Here goes my trouble, I want to create a new wallpaper for my Note Pro with the new Lollipop update. In the past, all you had to do it to create a 2560x2560 picture and place what you wanted on the middle. But now it doesn't work, if you put a square picture, when you set a picture as wallpaper, android do a strange rotated version... ruining all the work. With the default wallpapers there's no worries but here, I don't get why or how to do that, why did they change that seriously ? all my past wallpaper doesn't work anymore (and no I didn't root it, I don't want to lose warranty).

Can someone help me or give me a correct canvas ?

Thanks !