A photographic or cinematographic film system consisting of two layers of different color-sensitive emulsions stacked together to simultaneously capture different color information.
From 'bi-' (two) + 'pack' (package). This cinematography term was developed in the early 20th century as a technical solution for color film photography before modern color processes were perfected.
Bipack film was ingenious but complicated—old Hollywood used it to capture vibrant colors by literally stacking two different light-sensitive films together, though modern digital cameras now do this with single sensors, making those old films seem like fascinating relics.
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