Optical density

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Description

The measurement unit for opacity. Optical density is expressed on a logarithmic scale as the reciprocal of transmittance.

Synonyms and Related Terms

Schwärzung (Deut.); densité optique (Fr.);

Authority

  • ASTM, Standard Terminology of Microscopy, Annual Book of ASTM Standards, Section 14, General Methods and Instrumentation, ASTM, E175, 75-78, May 1982
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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