How is gloss measured?
Gloss is measured by shining a known amount of light at a surface and quantifying the reflectance. The angle of the light and the method by which the reflectance is measured are determined by surface and also aspect of the surface appearance to be measured.
Different aspects of the gloss of a surface are described by Hunter.
|The ratio of light reflected at a specified andlge to the incident on the surface at the same angle on the other side of the surface normal.|
|Gloss at grazing angles of incidence and viewing|
|Ratio of Specularly reflected light and that diffusely reflected normal to the surface|
|A measurement of the absence of haze or a milky appearance adjacent to the specularly reflected light|
|Sharpness of specularly reflected light.|
|Perception of surface soothness and uniformity||Overall visual assessment|
Hunter’s 6 ways to describe gloss.