gray scale

noun
a scale of achromatic colors having several, usually ten, equal gradations ranging from white to black, used in television and photography.

Origin:
1935–40

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

gray scale n.
Gray-scale ultrasonography.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Kodak gray scale in the image, adjust the scanner settings using the image of the gray scale to meet the above requirements.
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