Title: Edges in illumination control appearances in natural HDR scenes
Abstract: The light we see is controlled by both illumination and surface reflectance. The high range of light in natural scenes is the result of nonuniform illumination. The range of reflected light from colorants is limited. Surface reflections can vary from a maximum near 100% to a minimum near 3 % of incident light. The range of illumination in the natural scene is unlimited. How does that affect appearance? Slow gradients in light are barely visible. Sharp edges in illumination affect our vision the same as edges in reflectance. Every day we see objects on our light-emitting displays. Those objects are illumination images. In AIC’s history, there have been many remarkable discoveries, and many rediscoveries, in all areas of color. Using High-Dynamic Range Picture Making as an example, this paper will review how color has changed, and not changed, throughout AIC’s 1967-2021 history discussing Art, Design, Colorimetry, Color Technology and Vision.