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       invert_raw_image - invert 2D image along either or both axes


       invert_raw_image xsize xsize [bytesperpixel]


       invert_raw_image  reads  an  image from standard input and copies it to
       standard output, inverting along either or both dimensions according to
       the arguments.

       The  parameter xsize specifies the number of pixels in the x-direction.
       Use a negative number to flip the image along  this  axis.   Ditto  for
       ysize.  The number of bytes per pixel defaults to 1 if not specified.