Posterization of Grayscale Images

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.
In this Demonstration, a grayscale image is separated into five areas of equal gray-level using four threshold values: to . These areas can be given five distinct colors ( to ) within a selected color scheme.
In Mathematica tone separation is achieved using Binarize and coloring can be done using one of the color schemes in ColorData.

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