Posterization of Grayscale Images
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Posterization (tone separation, thresholding) is a process for reducing the tonal information in an image to a number of discrete levels that are subsequently given different colors.
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Contributed by: Erik Mahieu (March 2011)
Open content licensed under CC BY-NC-SA
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"Posterization of Grayscale Images"
http://demonstrations.wolfram.com/PosterizationOfGrayscaleImages/
Wolfram Demonstrations Project
Published: March 7 2011