Fill Light
Adjust the depth of shadows created by the key light, keeping important dark areas readable while preserving their shape.
Prompt
Use Fill Light while preserving the selected key-lit baseline: retain exactly the existing upper camera-left key light, its brightness on lit surfaces, the current wall light pattern and the original cast-shadow direction and outline. Add only a weaker broad neutral fill from near camera-right to lift the existing dark side of the face, inside the coat and the dark trouser folds. The shadow-side details should become noticeably more readable but stay darker than the key-lit side. Do not brighten the key, move or create any cast shadow, change wall light patterns, add rim light or flatten all contrast.
Text: fuse technique research · Examples: imagery generated in-house at fuse (Characters: Biwa · Setting: Minimalist Painterly Corridor Alcove)
Other techniques
Edge LightCreate a narrow line of light along the edge of a figure or object to separate it from the background.Portrait
HeadroomControl the space between a person's head and the edge of the frame to avoid unnecessary emptiness or unintended cropping.Composition
Cross LightingLight a figure or action area from opposing sides so that both directions retain depth and definition.Portrait
Without techniqueWith techniqueThe divider moves automatically. Hover or focus to pause and drag it.
Effect comparison
The baseline image already has key light, leaving the shadowed side of Biwa's face, the inside of her coat and the trouser folds darker. Adding fill light makes detail in those shadows easier to see while preserving the existing patch of light on the wall and the cast shadow on the floor. Fill changes the depth of the shadows: the viewer can read more clothing and facial detail while still recognizing the key light's direction.
Without techniqueWith technique