Early in-camera compositing technique — multiple negatives exposed onto each other to create double exposures or overlays directly in the original. Foundation of modern compositing.
Multiple exposure in-camera — that was the core strategy practiced by filmmakers around the turn of the century to realize visually complex scenes without cuts or post-production. The Bernardi Process systematized these handlings: several film negatives were precisely layered on top of each other and exposed sequentially to burn double exposures, dissolves, or composites directly into the film stock. No matte screens, no optical printing like later — pure mechanical layer-changing play.
The practice on set was elaborate but elegant in its directness. You needed a stable camera system that wouldn't shift between exposures, and precise masks or aperture frames to control which areas of the image were exposed. An actor could move in front of the camera while a second negative exposed a different scene behind him — or the same actor could appear twice in the frame if you limited the exposure regionally. The result was immediately visible in the original negative, no separate printing step necessary.
Where the process reached its limits: loss of quality due to multiple exposures (contrast, grain, color cast), minimal post-hoc controllability, and the logistical complexity of handling multiple negatives simultaneously. A scratch on the wrong negative, a deviation in exposure time by a tenth of a second — and the entire shot was waste. For more elaborate effects, filmmakers therefore switched to optical printing, which offered more control, even if it was more time-consuming.
Today, the process is a museum reference — important for archivists and VFX historians to understand how early filmmakers created illusions long before digital compositing existed. Modern compositing software has translated the Bernardi logic into the immaterial: layers, masks, blend modes. Understanding the old mechanics provides better access to why certain workflows function as they do today.