optical density
The range of tones that can be captured by a device. Optical density is measured on a scale of 0 for white to 4 for black.
optical resolution ...
DENSITOMETER-Device to measure the optical density of an image or base by measuring the amount of incident light reflected or transmitted.
11, which is a plot of optical density of a Agfa Brovira paper versus the time required to gradually increase the light intensity from zero to a certain value.
Film speed is found from a plot of optical density vs. log of exposure for the film, known as the D-log H curve or Hurter-Driffield curve.
Dynamic Range: The dynamic range or Optical Density of a scanner is a measure of the range of densities and the deepest shadow density that the scanner can see into and record information.
n = c / v This property is also known as optical density and expressed as nD20. The number 20 represent the Celsius temperature of the sample while D represents the monochromatic D line of the sodium spectrum (wavelength: 589.3 nm).
Densitometer - An instrument used for measuring the optical density of an area in a negative or print.
Density - The darkness in a negative or print area that determines the amount of light that will pass through it or reflect from it.
Base plus fog
The optical density of an unexposed area of processed film. This takes into consideration the density of both the base and the emulsion.
densitometer
an instrument for measuring the optical density of a photographic image or color in color printing.
densitometer, combination
measures both reflection and transmission densities.
The preferred pattern is called a sine wave pattern where the optical density varies between black and white smoothly and the line profile looks like a sine wave.
A transmission densitometer can be used to check reproduction dot sizes in order to maintain quality assurance in color. Both measure optical density and are considerably more sensitive and accurate than is the human eye.
 See also: Density, Image, Light, Film, Photograph
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