func doCreateImage(_data)
  println('header("Content-type: image/', Type, '");')
  if(isdef(Image))
    println(_img, ' = ImageCreate(', Width, ', ', Height, ');')
  else
    println(_img, ' = ImageCreateFrom', Type, '(', Img, ');')
  end
  event(onCreateImage, _img)
  println('Image', Type, '(', _img, ');')
  println('ImageDestroy(', _img, ');')
end

func HImage()
  return(_img)
end