Which of these best describes how we process the brightness of an object?
a) We process light as a linear change, so that an increase in the number of photons reflected by an object
b) We perceive brightness as a logarithmic function, meaning that small changes in brightness are more noticeable in dim conditions than in bright conditions
c) Our perception of brightness remains constant regardless of the level of illumination
d) Brightness is perceived as an exponential function, directly proportional to the intensity of light emitted by the object