bilevel_channel.rb.html

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  <title>RMagick example: bilevel_channel.rb</title>
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<h1>bilevel_channel.rb</h1>
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<pre class="language-ruby">
# frozen_string_literal: true

require 'rmagick'

img = Magick::Image.read('images/Flower_Hat.jpg').first
result = img.bilevel_channel(2 * Magick::QuantumRange / 3, Magick::RedChannel)
result.write('bilevel_channel.jpg')
exit
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