The Basics
Let's go over a few of the key definitions in compositing.- Compositing
The assembling of various pictorial pieces to create a complete picture. The pieces can be still images or animation; they can be added or subtracted. Typically, color correction, 2D effects, and scene-transition effects are added at this time. - Layers
The various pieces to be composited, and the order in which they are stacked. It's important not to think of the process as putting together pieces of a jigsaw puzzle, but as an additive process that places the layers on top of one another. - Alpha Channel
An 8-bit grayscale picture that functions like a stencil. Blurring the picture will produce a soft-edged selection. - Matte
Synonymous with an alpha channel, a matte can be generated on the fly in a good compositing program. This can be done with a range of pixel colors, luminance, or a variety of attributes, depending on the software. Various operations, like color correction or making the area see-through, can then be performed.
Dealing with end-game compositing requires a shift in thinking on the part of the 3D artist. We have been trained to deliver a completed picture that pleases the eye and meets the design requirements. When working with compositors, the artist must deliver an intertwined series of components that can be modified and assembled at the end of the production process. |
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