The wallpaper for the login screen is different from the one on the desktop. Here, maybe this Community Q&A entry will help: http://elementaryos.org/answers/how-to-change-background-picture-in-login-screen
The wallpaper for the login screen is different from the one on the desktop. Here, maybe this Community Q&A entry will help: http:// elementaryos. org/answers/ how-to- change- background- picture- in-login- screen