A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Search Definitions case sensitive First Edition Preface  Second Edition Preface  Acknowledgments

brightness—1. A perceptual property related but not identical to luminance. The brightness of an object depends not only on its luminance but also on that of its surroundings. For example, an object of uniform luminance will appear brighter against a dark background than against a bright background. 2. See radiance.