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edge.rb.html
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<!DOCTYPE public PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<title>RMagick example: edge.rb</title>
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<h1>edge.rb</h1>
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<pre class="language-ruby">
# frozen_string_literal: true
require 'rmagick'
# Demonstrate the Image#edge method
img = Magick::Image.read('images/Flower_Hat.jpg').first
img = img.quantize(256, Magick::GRAYColorspace)
img = img.edge(5)
img.write('edge.jpg')
exit
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