A gray card is a middle gray reference, typically used together with a reflective light meter, as a way to produce consistent image exposure and/or color in video production, film, and photography. A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum.
A gray card is a middle gray reference, typically used together with a reflective light meter, as a way to produce consistent image exposure and/or color in video production, film, and photography. A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum.
Source: Wikipedia "Gray card" · CC BY-SA 4.0
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