Rim light is a photography and cinematography technique where a light source is placed behind the subject to create a bright outline or "rim" of light. This is also sometimes called a hair light, edge light, or kicker light
The main purposes of using rim light are:
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Separation: It helps to separate the subject from the background, adding depth and a three-dimensional feel to an otherwise flat, two-dimensional image.
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Emphasis: It highlights the contours and shape of the subject, adding visual interest and drama.
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Mood: It can be used to create a striking, mysterious, or cinematic effect, especially when the front of the subject is underexposed or in shadow.
Rim lighting can be achieved with a variety of light sources, including studio strobes, flashes, or even natural light like the sun. The light is typically positioned behind the subject and angled towards them, often to the side, to catch the edges and outline their form