1. A color image sensor, comprising: imaging elements each structured to form, at an image plane, an image of a subject having a respective magnification, ones of the imaging elements forming respective ones of the images with the same magnification in light of mutually different colors constituting a set characterized by the magnification of the images the sets having mutually-different magnifications; and a light sensor located in the image plane and comprising a region of sensor elements disposed opposite each of the imaging elements, the regions of sensor elements opposite each of the sets of imaging elements being operable to generate, in response to light incident thereon, a respective color image signal representing the image of the subject at the respective magnification.