http://ramok.tech/2017/09/18/kmeans-image-color-reduction-with-java-and-spark/

Java Machine Learning Application for reducing images colors KMeans implementation from Spark MLib was used for grouping similar colors together and instead of representing thousands of colors the image is transformed to represent only few colors(16,32,54)

License to EPL https://www.eclipse.org/legal/epl-v10.html