Brightness Function

The Brightness Function is a concept used to describe how the brightness of a surface or light source is perceived by the human eye. It suggests that brightness is not only determined by the actual amount of light but also by factors such as color, surrounding light, and contrast. Essentially, a surface may appear brighter or darker depending on these factors, even if the actual light intensity is the same. This function is important in fields like photography, design, and visual arts, helping to create images that effectively convey the desired mood or focus.