ABSTRACT
This chapter introduces basic concepts of visible light, the units used for measuring it, the human visual system (HVS) focusing on the eye, and color spaces. These concepts are fundamental in High Dynamic Range (HDR) imaging as they encapsulate the physical-real values of light, from very dark values to very bright ones. HDR imaging has revolutionized the field of computer graphics and other areas such as photography, image processing, virtual reality, visual effects, and the video game industry. An HDR image may be generated by capturing multiple images of the same scene at different exposure levels and merging them to reconstruct the original dynamic range of the captured scene. There are several algorithms for merging Low Dynamic Range (LDR) images. Once HDR content has been efficiently captured and stored, it can be utilized for a variety of applications. HDR data stores detailed lighting information of an environment.
