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

    # Demonstrate the Image#color_point method

    f = Magick::Image.new(100,100) { self.background_color = 'white' }
    red = Magick::Pixel.from_color('red')
    f = f.color_point(50,50, red)

    circle = Magick::Draw.new
    circle.stroke('gray50')
    circle.fill_opacity(0)
    circle.circle(50,50,55,55)
    circle.draw(f)

    f = f.border(1,1,'black')
    #f.display
    f.write('color_point.gif')
    exit