Lighting Ratio's

Lighting Ratio's are something cinematographers and gaffers use to keep track of lighting setups across different shooting days when they're shooting a film. It also refers to the comparison of the main source of light from which shadows fall to the light that fills in shadow areas. Contrast ratio refers to the difference in the amount of light between the light coming from your key light and your fill light. The higher the ratio not bigger the difference between key and the fill is the more dramatic and noir-ish it looks lower the difference if you get the same amount of light from the key and fill the flatter it's going to look and the more it's going to look like you're shooting a sitcom. 

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