Definition
What is compositing in video editing?
Compositing combines two or more visual elements—such as filmed footage, graphics, text, effects, and 3D renders—into a single final frame. The work makes those layers appear intentional and, when required, as though they occupied the same scene.
A composite may be simple, such as a logo over video, or complex, such as an actor integrated into a digital environment. Transparency from an alpha channel, mask, matte, or chroma key determines where one layer reveals another. Blend modes can combine image data without treating a layer as simply opaque or transparent.
Convincing composites match more than edges. Editors compare position, scale, lens perspective, camera movement, grain, focus, motion blur, color temperature, and shadows. A technically clean key can still look artificial if the foreground does not share the visual conditions of the background.
Example in the edit
A product shot is filmed on a tabletop, then composited with animated callouts, a replacement screen image, and a softly blurred virtual background.
Why editors use it
Compositing expands what can be shown, from routine graphic overlays to invisible effects work. It gives editors a controlled way to combine assets while preserving a coherent image.
Quick answers
Frequently asked questions about Compositing
What is the difference between compositing and editing?
Editing arranges shots over time to shape a story. Compositing combines visual elements within the same frame to create or modify a single shot.
Does compositing always require a green screen?
No. Green-screen keying is one way to create transparency. Composites can also use masks, roto mattes, alpha-channel graphics, blend modes, or fully designed layers.
What makes a composite look realistic?
Matching perspective, camera motion, scale, lighting, color, edge quality, focus, grain, shadows, and motion blur makes separate layers feel as though they belong together.