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grey card (18% greycard).

This is the brightness level of a pixel representing it’s lightness from black to white. It is usually defined as a value from 0 to 255, with 0 being black and 255 being white.

allthingsphotography

grey card (18% greycard).

A term used to describe an image containing shades of grey rather than colour. Most commonly referred to as a black and white photograph.
allthingsphotography

grey card (18% greycard).

Tone used as representative of mid-tone of average subject. The standard grey cardreflects 18 per cent of the light falling on it.
mirglossary

grey card (18% greycard).

One of the 256 tonal steps that form a digital photo.
ephotozine

grey card (18% greycard).

Set of tones displayed in steps from minimum to maximum density.
ephotozine