# watermark.rb

    #!/usr/local/bin/ruby18 -w

    require "RMagick"

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

    # Make a watermark from the word "RMagick"
    mark = Magick::Image.new(140, 40) {self.background_color = "none"}
    gc = Magick::Draw.new

    gc.annotate(mark, 0, 0, 0, -5, "RMagick") do
        gc.gravity = Magick::CenterGravity
        gc.pointsize = 32
        if RUBY_PLATFORM =~ /mswin32/
            gc.font_family = "Georgia"
        else
            gc.font_family = "Times"
        end
        gc.fill = "white"
        gc.stroke = "none"
    end

    mark = mark.wave(2.5, 70).rotate(-90)

    # Composite the watermark in the lower right (southeast) corner.
    img2 = img.watermark(mark, 0.25, 0, Magick::SouthEastGravity)
    img2.write("watermark.jpg")

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