-
Notifications
You must be signed in to change notification settings - Fork 2
/
contrast.rb.html
62 lines (53 loc) · 1.7 KB
/
contrast.rb.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
<!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: contrast.rb</title>
</head>
<body>
<h1>contrast.rb</h1>
<div class="bodybox">
<div class="bodyfloat">
<pre class="language-ruby">
# frozen_string_literal: true
require 'rmagick'
# Demonstrate the Image#contrast method
img = Magick::ImageList.new('images/Flower_Hat.jpg')
img.resize!(0.5)
# Prepare to label each image with a number from 1 to 4
legend = Magick::Draw.new
legend.stroke = 'transparent'
legend.pointsize = 12
legend.gravity = Magick::SouthEastGravity
# Add 3 images, each one having slightly less contrast
f = 1
3.times do
img << img.contrast
# Annotate the previous image
legend.annotate(img[f - 1], 0, 0, 7, 10, f.to_s)
f += 1
end
# Annotate the last image
legend.annotate(img, 0, 0, 7, 10, f.to_s)
# Montage into a single image
imgs = img.montage do |options|
options.geometry = Magick::Geometry.new(img.columns, img.rows)
options.tile = '2x2'
end
imgs.write('contrast.jpg')
# imgs.display
exit
</pre>
</div>
</div>
<div id="close"><a href="javascript:window.close();">Close window</a></div>
</body>
</html>