Split Lighting
A 90-degree key that divides the face in half, used when a character is concealing, divided or dangerous.
What it does
Split lighting puts the key at ninety degrees so one half of the face is lit and the other falls away, with the ridge of the nose as a hard meridian. It is among the most editorial lighting patterns: it does not flatter, it divides. Emotionally it reads as concealment, moral dualism, or a person who will not give you the whole of themselves. Gordon Willis split Brando in The Godfather until the character became a landscape of power and shadow. Roger Deakins used a colder split on Javier Bardem in No Country for Old Men, so Anton Chigurh seemed lit like a blade. Greig Fraser's cave portraits in The Batman often sit on this knife-edge. Use it when a character is dangerous, divided or withholding. Do not use it for romantic union, for comedy, or for any scene that needs the eyes on both sides of the face to track with equal weight, because the shadow eye will drop out and the audience will feel shut out.
The prompt
Replace [Subject] with what you are shooting. Everything else is deliberate: the gear, stock and lighting are what push a generator towards this look.
Works well in
Midjourney, Stable Diffusion, Runway Gen-3
Pairs with
The Prompt Atlas
Every prompt here is a starting point. The Prompt Atlas is the full system: hundreds of production-ready prompts organised by outcome, with the reasoning behind each one so you can adapt rather than copy.