1. An image capture device comprising: a light-sensing array operable to detect light; a mapping unit operatively coupled to the light-sensing array and configured to represent intensities of light sensed by elements of the light-sensing array as digital image values according to a response function; and an exposure compensation circuitry operatively coupled to the mapping unit and configured to control the mapping unit such that a fixed point in the mid-range of the response function is made to correspond to a midpoint of the output image values, the response function being based at least in part on a functional model of: L OUT = c 1 + c 2 ⁢ L IN n 1 + c 3 ⁢ L IN n with L OUT being an output of the mapping, L IN being an input of the mapping, and n, c 1 , c 2 , and c 3 being numeric parameters of the exposure compensation mechanism that control the mapping unit.