1. An automatic white balancing system, the system comprising: a cast detector configured to receive and classify an input image based at least in part on a selection of constituent pixels of the input image, wherein the cast detector is further configured to select the constituent pixels based on a computed reliability of each of the constituent pixels to convey at least one characteristic of a capture illuminant; and a cast balancer configured to perform white balancing of the input image based on the classification of the input image by the cast detector, wherein the cast balancer is further configured to identify the capture illuminant based on at least one characteristic represented by each of the selected constituent pixels.