useOSConvert "P3 3 2 255 255   0   0   0 255   0    0   0 255   255 255   0   255 255 255  0   0   0"  ;
val it =
   fromList[0wxFF, 0wxD8, 0wxFF, 0wxE0, 0wx0, 0wx10, 0wx4A, 0wx46, 0wx49,
      0wx46, ...]: BinIO.vector