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592 B
592 B
Gray Card
- [pull] grey card
- [go] https://en.wikipedia.org/wiki/Gray_card
- [quote] A primary use of gray cards is to provide a standard reference object for exposure determination in photography. A gray card is an (approximate) realization of a Lambertian scatterer; its apparent brightness (and exposure determination) therefore depends only on its orientation relative to the light source.