$open_rgb_file      call=open_rgb_file      size=32 maxargs=3  roparm=ffffffff nocallback
$open_out_file      call=open_out_file      size=32 maxargs=1  roparm=ffffffff nocallback
$output_pixel       call=output_pixel       size=32 maxargs=2  roparm=ffffffff nocallback
$output_all         call=output_all         size=32 maxargs=19 roparm=ffffffff nocallback
$close_output_files call=close_output_files size=32 maxargs=2  roparm=ffffffff nocallback