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matte_floodfill.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">
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<title>RMagick example: matte_floodfill.rb</title>
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<h1>matte_floodfill.rb</h1>
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<div class="bodyfloat">
<pre class="language-ruby">
# frozen_string_literal: true
require 'rmagick'
img = Magick::Image.new(200, 200)
img.compression = Magick::LZWCompression
bg = Magick::Image.read('plasma:fractal') { |options| options.size = '200x200' }
bg[0].alpha(Magick::DeactivateAlphaChannel)
gc = Magick::Draw.new
gc.stroke_width(2)
gc.stroke('black')
gc.fill('white')
gc.roundrectangle(0, 0, 199, 199, 8, 8)
gc.fill('yellow')
gc.stroke('red')
gc.circle(100, 100, 100, 25)
gc.draw(img)
img.write('matte_floodfill_before.gif')
img.fuzz = 100
img = img.matte_floodfill(100, 100)
# Composite the image over a nice bright background
# so that the transparent pixels will be obvious.
img = bg[0].composite(img, Magick::CenterGravity, Magick::OverCompositeOp)
img.write('matte_floodfill_after.gif')
exit
</pre>
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