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ISO 5-1:1984 Photography -- Density measurements -- Part 1: Terms, symbols and notations
standard by International Organization for Standardization, 03/01/1984
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Specifies definitions, symbols, notations and a coordinate system for applications in photography and radiometry to describe the geometric factors affecting optical transmission and reflection measures. Provides a system for describing methods of measuring or specifying the transmission and reflection properties of photographic materials.