Fill Light
Definition
A Fill Light is a secondary light source used to illuminate the shadow side of a subject — the side not lit by the key light. The fill light reduces the contrast of the lighting setup by "filling in" the shadows created by the key light. The ratio between the key light and the fill light (the "lighting ratio") determines the overall contrast and mood of the lighting. A high key-to-fill ratio (e.g., 8:1) creates dramatic, high-contrast lighting with deep shadows, while a low ratio (e.g., 2:1) creates soft, even, low-contrast lighting.
Contextual Usage
The DP assesses the lighting setup: "The key light is giving us great directionality, but the shadow side of the face is too dark — we're losing all the detail. Let's add a fill light on the opposite side, but keep it very soft and low — maybe a 4:1 ratio. I want to see the shadow, but I don't want it to be completely black."
About this section
Production — or "principal photography" — is the phase in which the film or video is actually shot. It is the most visible and, typically, the most expensive phase of the entire process. Every day on ...
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