Multiple negatives or positives layered and exposed together in darkroom or digitally — creates double exposures, montages, or impossible scenes in-camera. Pre-digital VFX standard.
You know how it is: In the past, when you needed a scene where an actor stood next to themselves or a ghost walked through a wall, there was only one real option — multiple exposures on the same negative. In the darkroom, or later digitally, it was built up layer by layer. That's composite photography — the classic craft before DI and After Effects. And honestly: Many modern VFX supervisors never truly understood the principle because they only work with layers now.
The process works like this: You would make a first exposure of an element — say, an actor against a black background — then mask off that area and expose the second layer, for instance, a background or another character. In the analog workflow, this was called in-camera matting or darkroom work with masks, cameras, and enlargers. Each layer had to be in perfect registration. One mistake — and you start over. This created a craftsmanship accuracy that digital compositors often miss today. You had to think like a printer, not a clicker.
On set itself, composite photography played a different role: multiple exposures directly in the camera — the same frame exposed twice — created dissolve effects or superimposed images without cuts. This was fast, required no post-production, and gave directors immediate visual feedback. Hitchcock, Méliès, later science fiction teams — they all worked with it. Exposure metering was critical; you had to calculate every stop, otherwise the final composition would be over- or underexposed.
Today, composite photography is still relevant in hybrid workflows — not as the primary method, but for special looks. Some DPs prefer analog compositing because the grain and the optical flow (not to be confused with motion blur) appear more natural. It's also used in restoration or for found-footage scenes, drawing on this aesthetic. You can play with it: If you mix analog elements with digital editing, you notice it immediately — and that can be intentional.
The difference to modern chroma key compositing or digital keying lies in control and physicality. With composite photography, you don't need movement in the background; static elements are ideal. On the other hand, you have no artifacts, no fringing problems. The edge remains sharp and clean — or deliberately soft, if you plan it that way. For camera tests and test shots on set, some still use this method today because it's fast and immediately shows whether an idea works.