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

    # Demonstrate the Image#stegano method.

    # Create a small watermark from the Snake image by
    # shrinking it and converting it to B&W.
    begin
        watermark = Magick::Image.read('images/Snake.wmf').first
        watermark.scale!(64.0/watermark.rows)
        watermark = watermark.quantize(256, Magick::GRAYColorspace)
        wmrows = watermark.rows
        wmcols = watermark.columns

        # Read the image in which we'll hide the watermark.
        jj = Magick::Image.read('images/Jean_Jacket.jpg').first
        jj.scale!(250.0/jj.rows)

        # Embed the watermark starting at offset 91.
        puts 'Embedding watermark...'
        stegano = jj.stegano(watermark, 91)

        # Write the watermarked image in PNG format. Note that
        # the format must be lossless - Image#stegano doesn't work
        # with lossy formats like JPEG.
        stegano.write('jj.png')

        # Read the image and retrieve the watermark. The size
        # attribute describes the size and offset of the watermark.

        # This can take some time. Keep track of how far along we are.
        monitor = Proc.new { |text, quantum, span|
            printf("%s %3.0f%% complete\n", text, ((1.0-(quantum/span.to_f))*100.0))
            }
        Magick.set_monitor(monitor)
        stegano = Magick::Image.read('stegano:jj.png') {
            self.size = "#{wmcols}x#{wmrows}+91"
        }
        Magick.set_monitor(nil)

        # We don't need this any more.
        File.delete('jj.png')

        #stegano[0].display
        stegano[0].write('stegano.gif')

    rescue Magick::ImageMagickError
    	puts "#{$0}: ImageMagickError - #{$!}"
    end

    exit