the reflected light is a reflection of the direction of the incident light in the surface), and falls off sharply. Other waves While Lambertian reflectance usually refers to the reflection of light by an object, it can be used to refer to the reflection of any wave. For example, in ultrasound imaging, "rough" tissues are said to exhibit Lambertian reflectance. See also List of common shading algorithms Gamma correction References Radiometry Photometry Scattering, absorption and radiative transfer (optics) Shading