Chroma key compositing (or chroma keying) is a technique for compositing (layering) two images together. A color range in the top layer is made transparent, revealing another image behind. The chroma keying technique is commonly used in video production and post production.
Computer development also made it easier to incorporate motion into composited shots, even when using handheld cameras. In post-production, a computer can use the references to adjust the position of the background, making it match the movement of the foreground perfectly. Modern advances in software and computational power have even eliminated the need to use grids or tracking marks – the software analyzes the relative motion of colored pixels against other colored pixels and solves the 'motion' to create a camera motion algorithm which can be used in compositing software to match the motion of composited elements to a moving background plate.
In the making of Spiders Trap we will be using the green screen technique to save on Location shooting and to help us build the style of the film. The editor supervising these effects will be overseen by Mario Bortas an experienced CGI editor. See examples of green screen below
