When optical densities lie within the toe region of the curve, a 0.3 change in log exposure (change by a factor of 2) produces a direct effect on optical densities.

Question

Quizplus · Accepted Answer

When optical densities lie within the straight-line portion of the curve, changing exposure by a factor of 2 will have a direct effect on optical densities. This is not True when the optical densities fall in the toe or shoulder regions.

When Optical Densities Lie Within the Toe Region of the Curve