pamperspective - a reverse scanline renderer for Netpbm images

pamperspective
    [--bottom_margin=num]
    [--detail=num]
    [--frame_include=bool]
    [--height=num]
    [--include=[x1,y1;x2,y2; ...]]
    [--input_system=spec]
    [--input_unit=spec]
    [--interpolation=spec]
    [--left_margin=num]
    [--margin=num]
    [--output_system=spec]
    [--proportion=spec]
    [--ratio=num]
    [--right_margin=num]
    [--top_margin=num]
    [--width=num]
    {
      {
        upper_left_x upper_left_y upper_right_x upper_right_y
        lower_left_x lower_left_y lower_right_x lower_right_y
      }
      |
      {
        {--upper_left_x|--ulx}=upper_left_x
        {--upper_left_y|--uly}=upper_left_y
        {--upper_right_x|--urx}=upper_right_x
        {--upper_right_y|--ury}=upper_right_y
        {--lower_left_x|--llx}=lower_left_x
        {--lower_left_y|--lly}=lower_left_y
        {--lower_right_x|--lrx}=lower_right_x
        {--lower_right_y|--lry}=lower_right_y
      }
   }
   [infile]