Rim lighting
A light behind the subject that traces a bright outline along their edges, lifting them off the background.
See it
What it is
Put a light behind the subject, aimed back toward the camera but just off axis, and it grazes the edges instead of the front. The result is a bright contour tracing hair, shoulders, and jaw while the face stays lit by whatever else you have. It is the cheapest way to stop a dark subject from melting into a dark background.
Two dialects worth knowing. A subtle rim as part of a three-point setup is just good hygiene: separation, depth, a bit of gloss. A hard rim as the dominant light is a whole mood: think of sci-fi keyframes, sports brand work, and the cyan-and-magenta double rim that every synthwave poster runs on. Two rims from opposite sides in different colors is a standard trick.
Gotcha: rim light is unforgiving about frizz, lint, and stray hairs, because it lights exactly the stuff you normally do not see. It also flares easily since the source points at the lens, so flag it or angle it off axis unless you want the haze. Generative models often confuse 'rim light' with 'glow' and render a fake outer stroke, so ask for light wrapping the edge, not an outline drawn on top.
Ask AI for it
Light this subject with strong rim lighting: place a hard light behind and slightly above them, angled back toward camera so it carves a bright contour along the hair, shoulders, and jawline. Keep the front of the subject dim and the background dark so the rim is the brightest thing in frame. The rim must be light physically wrapping the edge of the form, falling off naturally, not a uniform glowing outline pasted over the silhouette.