With the Redstone update, Microsoft made one long awaited change in Windows 10. Now it is possible to set the sign in screen background image to any photo you want. Previously, it was hardcoded to the widely promoted "Windows Hero" image and could only be changed back to a solid color like in Windows 8. As Microsoft now plans to consolidate the lock screen and the logon screen into one, they have made this change. Let's see in detail how this works.