Separating Subject from Background
An edge-light is a crucial tool for creating a sense of depth and three-dimensionality in a cinematic image. Its primary function is to provide separation, preventing the subject from visually merging with a dark or similarly colored background. The light is typically placed behind the subject and to one side, aimed at the edge of their form. This ‘kicks’ a bright line of light along the contour of their hair, cheek, and shoulder, creating a crisp outline that makes them ‘pop’ from the scene.
Edge-light vs. Back-light
While they serve a similar purpose, an edge-light is distinct from a back-light based on its position:
- A back-light is positioned directly behind the subject, often high up, creating a ‘halo’ effect primarily on the top of the head and the crest of the shoulders.
- An edge-light (or kicker) is positioned further to the side, typically at a three-quarter back angle. It illuminates the side of the subject, tracing their profile.
A common professional setup involves using two kickers, one on each side, to define both edges of the subject.
Creating Shape and Texture
Beyond simple separation, edge-lights are essential for sculpting the subject and adding visual interest. They define the subject’s shape, which is especially important in low-key lighting where the key light is minimal. The bright edge highlights the texture of hair and clothing, adding a layer of polish and richness to the image. A well-placed kicker can transform a flat, two-dimensional image into one that feels tangible and lifelike. It’s a fundamental component of not just the classic three-point lighting setup but also of more complex and dramatic lighting schemes, and it’s a go-to technique for making subjects stand out in interviews and documentaries.