Welcome to Screen Blacker
Screen Blacker is a tiny OS X utility to temporarily change your desktop background(s) to black.
We built it to use with QLab.
Note: QLab 3.1 and later have similar functionality built in. In QLab, use
Tools -> Black out desktop backgrounds and
Tools -> Restore saved desktop backgrounds instead of Screen Blacker.
Screen Blacker requires Mac OS 10.6 or later.
You can download a pre-built copy of Screen Blacker here:
Click the button.