Understanding Light Spectrum Ratios: A Concise Guide | Valoya
Understanding Light Spectrum Ratios: A Concise Guide | Valoya
Apr 1, 2019
valoya.com
Lighting ratios describe the difference in light intensity between your key light and your fill light. The key is your primary source, while the fill exists to lift (or preserve) detail in the shadows. This relationship quietly dictates mood, realism, and focus. Brightness is measured in stops, where each stop represents a 2x (or 0.5x) change in intensity. For example, if your key side reads f/4 and your fill side reads f/2, that’s a two-stop difference (f/4 → f/2.8 → f/2) and a 4:1 ratio. A 1:1
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