The earlier chapters in this book have described numerous properties and advantages of high dynamic range (HDR) imagery. A major advantage is that HDR pixel values can cover the full range of light in a scene and can be stored as calibrated linear-response measurements of incident illumination. Earlier chapters have described how these images are useful for improved image processing, and for determining how a human observer might perceive a real-world scene, even if shown on a low dynamic range (LDR) display.
This chapter describes how HDR images can be used as sources of illumination for computer-generated objects and scenes. Because HDR images record the full range of light arriving at a point in space, they contain ...