#!/usr/bin/ruby -w require 'RMagick' include Magick img = Image.read('images/Flower_Hat.jpg').first begin result = img.posterize # Substitute the standard "Not Implemented" image rescue NotImplementedError result = Magick::Image.read("images/notimplemented.gif").first result.resize!(img.columns, img.rows) end result.write('posterize.jpg') exit