blue screen

noun

1. 1.The filmmaking technique of shooting foreground action against an evenly-lit monochromatic background for the purpose of removing the background from the scene and replacing it with a different image or scene.
2. 2.The visual effect resulting from this technique as well as the colored screen itself, especially blue.
3. 3.An error screen displayed by some operating systems, especially Microsoft Windows, after encountering an unrecoverable error which causes the system to shut down