Negative Fill

A way of placing a black board or cloth on the shadow side to soak up light bouncing in from the surroundings and make shadows darker. It is the opposite of fill, which adds light. In a room with lots of white walls, light bouncing off the walls weakens the shadows; blocking that reflection with negative fill raises contrast and makes the face look more dramatic.

Lighting positions seen from above. The key light is about 50° to the camera’s left, and a black board sits on the shadow side, to the camera’s right.

Camera view. The shadow side of the face sinks deep, so the difference from the bright side is large and it looks solid.

How it feels

Dramatic
Tension
Strong contrast
Weight
Dark mood

When to use it

Small rooms or studios with lots of white walls
Keeping one side in shadow, as in Rembrandt lighting
Keeping a silhouette black
Making one side of the face more dramatic outdoors

In the movies

The Godfather Part II (1974) · Source: Movieclips (YouTube) · Original video

Not to be confused with

Bounce Light: The opposite. A white reflector sends light back toward the shadow side to lighten it; negative fill soaks up light to deepen it.
Fill Light: Fill adds light to fill shadows. Negative fill removes light to make shadows darker.
Low-key: Low-key is the name of a resulting tone, dark with high contrast overall; negative fill is one of the tools that creates it.

Prompt

Keyword

negative fill

Descriptive

A key light from 50 degrees camera left, and negative fill on the shadow side keeping the far cheek deep and dark. High contrast, sculpted portrait.

Try these combinations

Close-up + Rembrandt + negative fill: deep shadows
Close-up portrait, Rembrandt lighting, negative fill from the opposite wall, deep shadows, dark background
Medium close-up + negative fill + low-key: a dark gym
Medium close-up, hard side key light, negative fill on the shadow side, low-key, a boxer in a dim gym