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Compositing is a post-production visual effect technique used in filmmaking, video production, and still image manipulation. It involves combining visual elements from separate sources into a single, coherent image. This is typically done by layering different image layers, often referred to as "elements" or "plates," over each other. The goal is to create the illusion that all these elements are part of the same scene, even if they were filmed or created at different times, in different locations, or with different techniques.

The process of compositing can be achieved through various methods, both traditional and digital. Historically, optical compositing techniques were used, involving specialized printers and cameras. However, with the advent of digital technology, digital compositing has become the dominant method. This involves using specialized software that allows artists to manipulate and combine image layers with high precision. Common digital compositing techniques include keying (such as chroma keying or luminance keying) to remove specific colors or brightness levels from a layer, allowing it to be replaced by another, and rotoscoping, which is the process of manually creating masks for specific objects frame by frame.

Compositing is fundamental to many visual effects, enabling the creation of fantastical creatures, impossible environments, and seamless integration of computer-generated imagery (CGI) with live-action footage. It is also widely used in advertising, motion graphics, and even in everyday photo editing applications to enhance or alter images. The success of compositing relies on careful attention to detail, including matching lighting, color, perspective, and grain between the combined elements to ensure a believable final image.