mirror
{
  in0  trump.ppm
  out  out.ppm
}
fade
{
  in0  trump.ppm
  out  out.ppm
  factor 0.2
}

gray
{
  in0  trump.ppm
  out  out.ppm
}

resize
{
  in0  trump.ppm
  out  out.ppm
  dims 640 480
}