fill light
US /ˈfɪl ˌlaɪt/
UK /ˈfɪl ˌlaɪt/
1.
a light used in photography or cinematography to soften shadows and reduce contrast, typically placed opposite the main light source
:
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The photographer used a fill light to illuminate the subject's face evenly.
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Without a fill light, the shadows on one side of the model's face were too harsh.