Method of determining exposure condition of photograph

摘要

A histogram of densities (Fig.3) represented by image signal components of an image signal obtained by reading out an image from a photographic film (10) is created. The density at a particular point on the histogram and the dynamic range of the image signal are obtained. It is determined that the photographic film (10) was underexposed when the density of the particular point is smaller than a first predetermined density and at the same time the dynamic range of the image signal is smaller than a predetermined value, and that the photographic film (10) was overexposed when the density of the particular point is larger than a second predetermined density and at the same time the dynamic range of the image signal is smaller than a predetermined value.