a system and method for automatically adjusting color parameters during a film - to - digital transfer . an operator uses standard telecine equipment to preview scenes in order to determine a natural clustering of fields or scenes . each cluster is processed separately . all the fields in a cluster are treated as one unit in the sense that color adjustments for the cluster are based on the cluster color histogram , which is computed by aggregating the colors from all pixels in the cluster . constraints are specified for the cluster . variables of a constraint may be automatically specified or determined by an operator based on observing sample frames from the cluster . in addition , the operator can nullify a constraint if desired . within each cluster , the system adjusts red , green and blue intensities of the digitizing device , gains for each of these color channels , and other parameters . the system first determines which settings respect the constraints and then optimizes the solution . the solution is optimized such that the digital color distribution is as faithful as possible to the film color distribution subject to the constraints . this is achieved by adjusting the settings to maximize the entropy of the empirical , digital color histogram among all settings respecting the constraints .