1. A method of displaying images, comprising: receiving an encoded image signal that includes a primary video signal representing a sequence of images that include a plurality of objects of interest, and includes metadata identifying one or more of a plurality of objects of interest in respective images of the sequence of images; supplying a selecting input to select one or more of the plurality of objects of interest based on the metadata identifying the selected one or more of the plurality of objects of interest; and expanding within the image signal during decoding for display, a range of gray levels encoded for the one or more of the plurality of objects of interest based on the metadata, comprising: identifying each of the one or more plurality of objects chosen by the selection input; identifying the sequence of images containing each of the one or more plurality of objects; and distinguishing each of the respective images of the sequence of images, within the image signal, and any image information requiring adjustment by an illuminating light source, and adjusting brightness of the illuminating light source for the one or more of the plurality of objects based on the metadata.