Method for measuring glossiness based on the psychological sense

It is pointed out that the conventional methods for measuring glossiness do not match well with psychological glossiness when the measuring range is wide, and when the object´s color changes. To solve these problems, a new definition of glossiness is presented, according to which it is defined as the ratio between the power of the specular reflected light luminance and that of the diffuse one from the object´s surfaces, on the basis of the psychological gloss. This matches well with the psychological glossiness over a wide range, regardless of the specimen´s color differences. Furthermore, it has been found that the psychological glossiness is roughly proportional to the ratio between the specular light brightness perceived by the human eye and the diffuse one