1. A color sensor for generating color information defining colors of an input image, the color sensor comprising: an input section including an array of transducer pairs, each transducer pair defining one of a plurality of pixels of said image, each transducer pair comprising at least two transducers each generating an output having a peak at a selected color, the selected color differing as between the two transducers, and each transducer having an output profile comprising a selected function of color; a color processing section including a plurality of color pixel processors each receiving the outputs from the two transducers comprising the transducer pair associated with a pixel, and for generating in response a color feature vector representative of the brightness of the light incident on the pixel and a color value corresponding to the ratio of outputs from the transducers comprising the transducer pair associated with the pixel; and a color boundary processing section for generating a plurality of color boundary feature vectors, each associated with a pixel, each representing the difference between the color value generated by the pixel color processor for the respective pixel and color values generated by the pixel color processor for pixels neighboring the respective pixel.