invert_raw_image - invert 2D image along either or both axes

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.

                                                                                             INVERT_RAW_IMAGE(1)

       invert_raw_image - invert 2D image along either or both axes

invert_raw_imagexsizexsize[bytesperpixel]