#!/usr/bin/ruby -w require 'RMagick' # Demonstrate the Image#edge method jj = Magick::Image.read('images/Jean_Jacket.jpg').first jj.scale!(250.0/jj.rows) jj2 = jj.edge(5) # Make a before-and-after composite jj2.crop!(jj2.columns/2, 0, jj2.columns/2, jj2.rows) jj = jj.composite(jj2, Magick::EastGravity, Magick::OverCompositeOp) jj = jj.border(1,1,'black') #jj.display jj.write('edge.jpg') exit