Exposure

In photography, the correct exposition is the average diaphragm of all the sheens of the scene. If in the scene, the skin of the subject would be the gray average value. The exposition will have to be realized for the value of the human white skin tone, which coincides with the neutral grey of 18 % of reflection. Other sheens of the scene were registering adequately for the latitude effect of the material.

Example: According to the intensity and contrast of the light. If a subject in the scene, demands diaphragm 4, the dynamic range (Latitude), following values have been considered.