characteristic curve

Photography. a graph used in sensitometry to show the relationship between exposure time and image density under constant developing conditions.
Also called sensitometric curve.

1900–05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
characteristic curve
photog a graph of the density of a particular photographic material plotted against the logarithm of the exposure producing this density

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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