Digital Compositing

Digital compositing combines visual elements from separate images into a single image, using techniques such as masking, layering, and color matching to make the result coherent.

Alpha compositing: A method for combining foreground and background pixels using the foreground’s opacity. It calculates how translucent foreground elements blend with the images beneath them.
Visual effects: Techniques that create or manipulate imagery for film, television, and other media. Digital compositing is a core method for combining visual-effects elements.
Raster graphics: Digital images represented as grids of picture elements called pixels. Most compositing operates on raster images or renders that become raster images.
Photomontage: An image made by assembling fragments of multiple photographs into a new composition. Photomontage is a collage tradition; digital compositing also includes precise pixel-level integration.
Alpha channel: An image channel that stores per-pixel opacity or transparency information. It supplies opacity values used to composite one image over another.
Chroma key: A technique that removes a selected color from an image and replaces it with another image. It separates a filmed subject from a colored background for compositing.
Pixel: The smallest addressable picture element in a raster image. Compositing combines pixel values to form the final image.
Image editing: The alteration of a digital image using software or other techniques. Compositing is one kind of image editing, focused on combining separate visual elements.
Image mask: A grayscale or binary image that controls which parts of another image are visible or editable. Masks isolate the portions of layers that should appear in the composite.
Matte painting: A painted or digitally created environment used to extend or replace a film scene’s background. Compositing joins matte-painted scenery with photographed footage.

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