negate_channel.rb.html

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

require 'rmagick'

# Demonstrate the Image#negate_channel method

img = Magick::Image.read('images/Flower_Hat.jpg').first
result = img.negate_channel(false, Magick::GreenChannel)
result.write('negate_channel.jpg')
exit
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