Blue screen

noun a photographic technique in which a subject is filmed in front of a blue background so as to allow matte compositing of the film with other footage; also the blue background

Merriam-Webster's Collegiate Dictionary
blue screen
blue screen of death
blue screen of life
blue
blue and the gray
blue and the grey
blue angel
blue annealing
blue asbestos
blue baby
blue basic lead sulfate
blue blood
blue book
blue box
blue boy
blue brick
blue brittle range
blue brittle temperature range
blue brittleness
blue button
blue catfish
blue cheese
blue chip
blue chip company
blue chip firm
blue chip rate
blue chip stock
blue cohosh
blue collar
blue collar worker