measuring the optical density of a substance by shining light on it and measuring its transmission
Densitometry is the measurement of the density or compactness of bone It is also an indirect method of determining body composition; using this method, percentage of body fat is computed from bone density (the ratio of body weight to body volume)
The determination of the optical density of a material, generally a photographic image, by either transmitted or reflected light with either a visual or photo-electric photometer (densitometer)
The measuring of optical density from a source, such as a transparency of reflection original The densitometric method of measuring tonal value is based on the light absorbing properties of grays or colorants Densitometers are used to measure the transmission or reflection of samples through selected, blue, green, red, and visual filters