All mapping methods described so far were based on raw image radiances only. As there is no information on objects' reflectances in the raw image, bright and dark objects can not be distinguished. The method described in this chapter, incident light metering, makes it possible to reproduce original objects' colors. That means if, e.g., a dark blue color is assigned to an object in the modelling phase, it will be displayed as dark blue in the final image, even if the whole scene is composed of dark objects (that is the case when other methods would fail, as described later). The inspiration for this method came from the incident light metering used in professional photography and the movie industry.