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9 terms
Photonics Dictionary
Clear All Filters x
opacity x
opacity
A measure of a material's inability to transmit light, equal to the reciprocal of its transmittance.
alpha
In computer imaging, a value representing opacity.
densitometer
1. An instrument used to measure the opacity or density of dyes, pigments or dispersed particles that form an image in or on a medium, such as a photographic film. 2. A device used to measure the...
gray scales
Transparencies that represent progressive steps in the amount of transmitted radiation for administering predetermined amounts of radiation to a radiation-sensitive substance. The steps are...
Hurter-Driffield curve
A plotted relation between Log E (logarithm to base 10 of exposure in metercandle seconds) and density (logarithm to base 10 of opacity).
O
opacity
opacimeter
An instrument for measuring opacity.
photoelectric densitometer
->
densitometer
1. An instrument used to measure the opacity or density of dyes, pigments or dispersed particles that form an image in or on a medium, such as a photographic film. 2. A device used to measure the...
skiatron
A system employing a dark trace tube in which the opacity of the screen is varied as a function of the power of the beam.
Photonics Dictionary
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