As my project requires me to use green screen due to the restricted height of the sound stage, I need to look at green screen and how it is used to create set extensions. One of the important features of the reception area of the Medical Research Centre is the creation of height and as the height of the stage is a little over 10 metres and needs to appear to be several floors below ground it needs a form of green screen/set extension to achieve this.
What is green screen?
It is a technique that was traditionally known as a travelling matte that allows actors to be shot in a studio environment and then is removed in post-production (sometimes production) and replaced with a different image. This can be anything from an external location background through to an architectural extension like my project design. Any colour can be used but blue and now green are used as they are the complement of the colours that make up the base colours of human skin tone. (Byrne, B., 2009)
What is a matte painting?
Matte paintings are usually of a location and used to extend a set, combined with live action, models or animation to create a composite image. Traditionally these were painted onto glass sheets and combined with optical techniques such as rear projection. Today they are painted digitally, then combined with the live elements of the shoot. (Rickitt, R., 2000)
I will need to create a design of a matte for my sound stage extension, so I am now looking at examples of green screen shots before finalising any designs. I found a selection of videos to show a few ways that a green screen can be used.
I thought that the second video was particularly interesting in the fact that they used a green screen technique combined with a scaled model and made a composite shot to save thousands of dollars. Theoretically this could be done with my interior as the character of Clayton only walks through the space. So instead of building a full-scale set in the sound studio, a model could be used with perhaps some small elements of set to create realism.
The Walking Dead uses a combination of real sets and real falling debris and green screen/set alteration to create a scene in which a helicopter falls through the ceiling. Realism here is created by using a combination of techniques. Green screen is only one part of the sequence.
Green screen can be used as a small part of a scene composite to allow real people to merge seamlessly, to extend a set, to allow stunts or to create a set in its entirety. What’s important, whether green screen is used or not, is that the design or visualisation of the scene is a collaborative process between the Production Designer/art department/VFX/stunt coordinators/ the Director etc. whether it is a CGI scene, scaled model or full set.
BYRNE, B., The Visual Effects Arsenal. Oxford: Focal Press, 2009.
RICKETT, R., Special Effects:The history and technique. London: Virgin Books, 2000.
You Tube videos:- [Sourced on 15/6/14]