Day for night

Shooting night in daylight and manufacturing the dark: underexposure, cool grade, skies avoided. The oldest special effect still working.

Night is expensive and slow to shoot, so cinema learned to counterfeit it: expose the sunlit scene down, cool the colour, keep the sky out of frame, and let the audience's grammar do the rest. The convention is a century old and, handled well, still invisible.

Its craft points are the giveaways: real night has sources, windows, moon, lamps, so fakes must plant them; shadows must not read noon-hard; and skies betray everything, which is why classic day-for-night frames tilt earthward. Modern grading has made the trick supler, but the principle is unchanged: darkness on screen is built, not found.