Definition of gray scales

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Photonics Dictionary

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 customarily calibrated in transmissivity (the ratio between transmitted and incident light), opacity (the inverse of transmissivity), or density (the log to base 10 of opacity). Thus, a step differs from its neighbor by increments -- a density of 0.3 transmits about half of the incident light; a density of 1, about one-tenth; 2, about one-hundredth; 3, about one-thousandth.

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