relight

On the rail as relight.

When to use it

Changing where the light comes from in a photo or a clip you already have: drag a light over it, set its colour and softness, see it live, then render it relit with real shadows and highlights.

When to reach for something else

Not for changing what is in the shot, its pose, its motion or its background. It keeps the scene and only moves the light; for a new look, use an image editor or Video Restyle.

How to use it

1. Use the card’s Reference area. The picture or clip to relight. Drag the light over it and set its colour and softness.
2. Pick a model in the pill at the top of the card, or keep GPT Image 2.5.
3. Press Run.

On the card

Control	What it does	Choices
Reference	The picture or clip to relight. Drag the light over it and set its colour and softness.
Run	Starts the run. The number on it is what this run costs in credits, worked out before you press.
×1	Runs the card several times in a row with the same settings.	1 to 99

Models

The pill at the top of the card picks the model. GPT Image 2.5 is the one a new card starts on.

Model	Good for
GPT Image 2.5	Prompt-scoped edits on one to six reference images with an optional mask, holding subject, composition and background across successive rounds; the everyday variant, quicker than Sunburst at the same price.
Nano Banana Pro	Google’s Nano Banana Pro on its true edit endpoint, the premium harmonizer on Blend in Scene and Social Media: position-faithful over up to fourteen inputs and composition-aware, so shadows, perspective and lighting integrate automatically.
H3 Max Relight	Relighting a clip quickly and cheaply: the shot, the people and their motion stay as they were and only the light changes.

GPT Image 2.5

Not the one for: Caps at six reference images and changes only what the prompt names, so it is the wrong pick for a bigger reference set or for a full restyle that should reinterpret the whole frame.

Behind the settings button:

Setting	What it does	Choices
Keep the background as it is	On, the new lights fall on the subject and the background keeps its own light. Off, the background takes the new light too.	On or off
Fill light	How much soft light fills the shadows: low keeps them deep, high keeps them open.	0 to 100 %
Follow the preview	Loosely reads the preview as a plan for the light and lights the picture the way a photographer would. Closely matches the preview’s light more exactly.	Loosely, Closely
Quality	The overall finish level. Higher looks better but costs more and is slower.	Medium, High
Size	The relit picture’s size along its longer side.	1K, 2K, 4K

Nano Banana Pro

Not the one for: An edit endpoint, so it needs an input image and cannot generate from words alone. 1K and 2K cost the same and 4K doubles the price; Ultra on those tools is the 4K route.

Behind the settings button:

Setting	What it does	Choices
Keep the background as it is	On, the new lights fall on the subject and the background keeps its own light. Off, the background takes the new light too.	On or off
Fill light	How much soft light fills the shadows: low keeps them deep, high keeps them open.	0 to 100 %
Follow the preview	Loosely reads the preview as a plan for the light and lights the picture the way a photographer would. Closely matches the preview’s light more exactly.	Loosely, Closely
Size	The relit picture’s size along its longer side.	1K, 2K, 4K

H3 Max Relight

Not the one for: A picture, which it cannot take, or a part longer than 14 seconds. A light from behind can come through faintly.

Behind the settings button:

Setting	What it does	Choices
Fill light	How much soft light fills the shadows: low keeps them deep, high keeps them open.	0 to 100 %
Resolution	1080p and 2K are refined from 768p and cost two and four times as much a second.	480p, 768p, 1080p, 2K
Seed	Random gives a new take each run. A number gives the same take again for the same clip and lights.	-1 to 999999