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channel.rb.html
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channel.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">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<meta name="generator" content="ex2html.rb" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="css/popup.css" />
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/github.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
<script>
hljs.configure({ cssSelector: "pre" });
hljs.highlightAll();
</script>
<title>RMagick example: channel.rb</title>
</head>
<body>
<h1>channel.rb</h1>
<div class="bodybox">
<div class="bodyfloat">
<pre class="language-ruby">
# frozen_string_literal: true
require 'rmagick'
img = Magick::Image.read('images/Flower_Hat.jpg').first
imgs = Magick::ImageList.new
imgs << img
imgs << img.channel(Magick::RedChannel)
imgs.cur_image['Label'] = 'RedChannel'
imgs << img.channel(Magick::GreenChannel)
imgs.cur_image['Label'] = 'GreenChannel'
imgs << img.channel(Magick::BlueChannel)
imgs.cur_image['Label'] = 'BlueChannel'
result = imgs.montage do |options|
options.tile = '2x2'
options.background_color = 'black'
options.stroke = 'transparent'
options.fill = 'white'
options.pointsize = 9
options.geometry = Magick::Geometry.new(img.columns / 2, img.rows / 2, 5, 5)
end
result.write('channel.jpg')
</pre>
</div>
</div>
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</body>
</html>