조명Ratio
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LightingRatio
Lighting Ratio Calculator
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Calculate and understand lighting ratios for professional portrait and product photography with balanced illumination.
Características Principales
Key-to-fill light ratio calculations
Main light to fill light intensity relationships
1:1, 2:1, 3:1, 4:1, and 8:1 ratio explanations
Modeling of light falloff and inverse square law
Reflector and diffuser impact on ratios
Visual guides showing ratio effects on subject
How to Use Lighting Ratio
Choose Your Ratio
Select a lighting ratio based on desired mood: 2:1 (flattering), 4:1 (dramatic), 8:1 (high-key)
Position Main Light
Place key light as primary illumination on the subject
Add Fill Light
Position fill light to reduce shadows, calculating intensity based on ratio
Measure Intensity
Use light meter to measure incident light from key and fill sources
Calculate Ratio
Divide key light value by fill light value to verify ratio
Adjust as Needed
Move lights or adjust power to achieve desired ratio
Casos de Uso
Professional portrait photography for flattering lighting
Product photography requiring specific shadow characteristics
Fashion and beauty photography with controlled modeling light
Studio video production with consistent lighting ratios
Preguntas Frecuentes
What is a 2:1 lighting ratio?
Key light is twice as bright as fill light, creating subtle shadows for flattering portraits.
What ratio is best for beginners?
2:1 or 3:1 ratios are forgiving and flattering, ideal for learning studio lighting basics.
How do I measure light ratios?
Use an incident light meter to measure illumination from key light and fill light separately.
Can I achieve ratios without a meter?
Approximately, yes. Adjust fill light position and intensity until shadows look appropriately filled.
Does ratio change with different modifiers?
Yes, softboxes, umbrellas, and reflectors modify light intensity and spread, affecting apparent ratio.