Is there an application for windows 7 that can capture the logon screen? There's an app called logon changer but it doesn't actually reflect the logon screen especially if you have replaced the authui.dll file. The app must not necessarily work like the snipping tool. Just something like , it will run on startup and it will just automatically save the .jpeg or .png file of the captured logon screen. Do you know something like that?
I haven't used the above software, so I cannot vouch for it. But it's an application to help you change the appearance of the login screen. It also seems to be able to preview what the login screen will look like. Maybe you could screenshot that preview?
The "Print Screen" (PrtSc) key might already work, try that. Use Alt+PrtSc to get just the active window (see this article).
[UPDATE] This doesn't work. I'm not deleting this answer to document the fact.