# affine_transform.rb

    #!/usr/local/bin/ruby19 -w
    require 'RMagick'

    # Demonstrate the Image#affine_transform method

    img = Magick::Image.read("images/Flower_Hat.jpg").first

    # Construct a simple affine matrix
    flipflop = Magick::AffineMatrix.new(1, Math::PI/6, Math::PI/6, 1, 0, 0)

    # Apply the transform
    img = img.affine_transform(flipflop)

    # Scale the image, make the background transparent,
    # and write it to a JPEG file.
    img.scale!(250.0/img.rows)
    img = img.matte_replace(0,0)
    img.write("affine_transform.jpg")

    exit

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