288X these measurements are through sensitometry and densitometry. When sensitometry and densitometry are used, variations from the standard and the corrections recommended are expressed in numbers, not in terms of personal opinion.
-Color sensitometry - method of determining the sensitivity of color materials.
-Color separation - process of photographic an image through filters to produce three black and white negatives that represent red, green and blue content.
Sensitometry - scientific study of the response of photographic materials to exposure and development. It establishes emulsion speeds and recommended development and processing times.
Driffield begin systematic evaluation of sensitivity characteristics of photographic emulsions - science of sensitometry.
D/log E curve
A graph of density (D) against the logarithm of exposure (log E) Used in sensitometry to compare the sensitivity of different emulsions to light.
A measurement used in sensitometry to describe the angle made between the straight line portion of the characteristic curve of the photograph emulsion and the base of the graph. The gamma is the tangent of the angle so formed.
 See also: Photograph, Film, Photography, Exposure, Light
  
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