Gray card

What is Gray card?

Gray card meaning in Digital terms is A gray card is used as a reference point for assisting to determine the exposure of objects in reflected light. Gray cards normally reflect 18% of the light falling on them. Ideally, gray cards are designed to be spectrally neutral and produce a diffuse reflection. Often times the alternate side of a gray card will be white, reflecting 90% of the light falling on it.


reference: Federal Agencies Digital Guidelines Initiative – Glossary