Process of encoding tonal information by using a logarithmic mathematical formula. The result ends up assigning more bits of information to the darker areas of the image. This closely matches the sensitivity of the human eye, which is more discerning of the blacks and shadows of an image. It requires 10 bits to capture the complete tonal range of film logarithmically.

kodakcineScale in which an increment of 1 corresponds to a multiplicative factor (10 for log10, 2 for log2). For example, the EV (exposure values) scale is a logarithmic scale, doubling the exposure corresponds to EV+1.

dxoglossary