ISO-12232 — EI & ISO speed

 Determination of exposure index, ISO speed ratings

Including standard output sensitivity, and recommended exposure index

Standard:	ISO 12232 — Photography— Electronic still picture imaging — Determination of exposure index, ISO speed ratings, standard output sensitivity, and recommended exposure index
Technical Committee:	ISO/TC 42 Photography
Published:	2006-04-15
Quality factors:	Sensitivity

ISO Sensitivity (or ISO speed) is a measure of how strongly an image sensor and/or camera responds to light. The higher the sensitivity, the less light (smaller aperture and/or shorter exposure time) required to capture a good quality image.

Imatest calculates Saturation-based Sensitivity S_sat from a tonal chart after measuring and inputting the incident lux level with an illuminance meter.

See our documentation page ISO Sensitivity and Exposure Index for details.