A garbage matte can be used to exclude parts of an image that a procedural prossess, such as bluescreen, would not remove. This might including a rig that is holding a model or the lighting grid above the top edge of the bluescreen. Garbage mattes can also be used to include parts of the image that might have been removed by the bluescreen, such as too much blue reflecting on a shiny model (blue spill). In common usage, an image (from Latin imago) or picture is an artifact that reproduces the likeness of some subject—usually a physical object or a person. ... Procedural programming is a programming paradigm based upon the concept of the modularity and scope of program code (i. ... The bluescreen setup The final image Bluescreen is the film technique of shooting foreground action against an even-lighted blue background, which is then replaced by a separately shot background plate scene by optical composition. ... Look up Rig in Wiktionary, the free dictionary In Norse mythology, see Ríg. ... A model is a substitute for or an abstraction of a specific thing. ...