Colorizing an Image
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A simple algorithm for colorizing a grayscale image works by propagating the color based on the difference of the luminance values of pixels. Choose a color, drag across the image, and click the Colorize button.
Contributed by: Maxim Rytin (March 2011)
Open content licensed under CC BY-NC-SA
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"Colorizing an Image"
http://demonstrations.wolfram.com/ColorizingAnImage/
Wolfram Demonstrations Project
Published: March 7 2011