How to change the picture of the interface when win7 login

Every time win7 boot, there will be an interface that asks you to enter the user name and password, but that interface is the default interface of win7, do you want to change to your favorite picture? I will teach you one below. The easy way.
1. First prepare a picture, the format is JPG, the size is controlled within 256KB. If you don't want the picture to be distorted, it is best to use the PS and other image software to make the picture suitable for your screen resolution. Rename the image to backgrounddefault.jpg.
2. In the start of the run, type regedit.exe to open the registry editor. Expand HKEY_LOCAL_MACHINEsoftware microsoft/windowsCurrentversionauthenticationlogonUIbackground and find the registry key OEMBackgound and change its value to 1.
3. Now go to C:WindowsSystem32oobe create a folder info under this folder, create a backgounds folder in it, and put your renamed image into this folder.
4. Now you can log out and re-enter the user login interface, you can see that you have changed to the picture you like.