Greenscreen Footage coming soon...
Greenscreen Footage - Professional Footage 4 Film and VFX Artisis.
But what is it all about? A blue screen or green screen in the background of the performers allows filling in the blue or green area with other pictures or sequences, later. In short, to change the background partially or completely. The colour ultramarine was already used in black and white shots. The actors on set stand in front of a ultramarine background, usually made of stretched fabric or actually a painted wall.
There was a yellow filter in front of the camera lens. Since yellow and ultramarine are complementary colours, they cancel each other out. That means, wherever there is ultramarine, the film material is not exposed. As a result, the optical printer. The optical printer, one of several projectors and a camera, which could be used to put the sequences together using semi-transparent mirrors, exposed the material that had not yet been exposed to other motifs.