Light Leak
A light leak in light leak film is unfiltered light that reaches the emulsion or sensor without passing through the taking lens, usually through a gap in the body, magazine, or gate. It fogs from the edge or along a scratch in the film path, often orange or red on color negative because it hits the base side.
Narrative function
The frame is wounded at the border. A wash of orange, red, or white eats density that the lens never saw.
It feels like damaged time: a Super 8 cartridge, a clock not seated, a magazine door. The pictured lamps are innocent.
Use it for memory, accident, or analog failure, when the camera body is part of the story. A leak can punctuate a cut or stain a whole take.
It is the wrong tool as a default nostalgia grade on a clean digital interior. If the wash sits in the middle of the frame and tracks a pictured sun, you are describing flare, not a leak.
If only highlight edges glow, that is halation.
How it works
Physically: open a gap at the magazine, leave a clock loose, or flash the film in loading. The fog often blooms from one edge and may shift as the film advances.
Recreating it: edge-based, warm, additive fog that can clip, unrelated to sources in the set. Prompt: analog leak from the frame edge, orange or red, emulsion wound, not a lens flare from a lamp.
When to use it
An apartment portrait with an orange bite coming in from the left, as if the cartridge failed, while the window practicals remain ordinary. Do not center a golden wash on the sun in frame and call it a leak.
Compared with similar shots
Lens Flare enters through the glass and ghosts the source. A leak bypasses the glass.
Halation is a halo around highlights already imaged. Film Grain is texture, not fog.
Light Flash is a temporal blowout of the whole frame, often as a cut. A leak is a spatial stain, usually from the edge.
In film
Spring Breakers uses analog damage, including leaks and blown edges, as party-memory texture. Super 8 (2011) treats cartridge wounds as period accident.
Home-movie Super 8 diaries are the grammar: edge fog, not a pictured lamp.
Prompt it
Put the wound on the edge, not on the sun. Example: Analog light leak washing [Subject], orange or red fog eating the frame edge, unfiltered light on the emulsion, not a source-linked lens flare.
What usually goes wrong
Wrong cousin: lens flare or halation. Tell: the colored wash tracks a lamp in shot, or a red ring around a bulb with a clean frame edge.
Fix: originate the fog from a body gap at the border, independent of pictured sources.
Questions
What is a light leak in film?
Light that hits the film or sensor without going through the taking lens, usually from a gap in the camera body. It fogs the image, often from the edge.
Light leak vs lens flare
Flare is scatter inside the optic from a pictured or near-frame source. A leak bypasses the lens entirely. One ghosts a lamp. The other stains the emulsion.
When should I use a light leak?
When memory or analog accident should mark the frame. Do not use it as a default warmth filter, or when the sun in shot is the real cause.
How do I prompt a light leak for AI image or video?
Specify edge-origin orange or red fog, emulsion damage, and independence from lamps in the scene. Ban source-linked streaks.
Melies can generate this Light Leak
Melies is the AI filmmaking workspace. This Light Leak opens with the optical prompt loaded, so the effect has a physical cause in the frame.