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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('black')
gc.circle(100, 45, 100, 25)
gc.circle(45, 100, 25, 100)
gc.circle(100, 155, 100, 175)
gc.circle(155, 100, 175, 100)
gc.draw(img)
img.write('matte_replace_before.gif')
# Set the border color. Set the fuzz attribute so that
# the matte fill will fill the aliased pixels around
# the edges of the black circles.
img.border_color = 'black'
img.fuzz = 10
img = img.matte_replace(100, 45)
# 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_replace_after.gif')
exit
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