The relations and differences between chromatic value and density value are explicated, and it′s especially explained that not only the ink thickness can be expressed but also color three dimensions attribute can be exclusively figured by color density.

OBJECTIVE To quantitatively analyze the degree of visible hyperaemia in the larynx of normal subjects and of patients with symptoms of chronic laryngitis by using a color analysis program.

Heavy metal and clay pollution information of waste ores has been extracted by mineral index and water pollution information by difference method and vegetation stress by density slice of NDVI based on ASTER data and reflectance curves of objects measured in the field.