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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. 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 ... and coloring can be done using one of the color schemes in ... .
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