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       ppmtoyuv - convert a portable pixmap into an Abekas YUV file
       ppmtoyuv [ppmfile]
       Reads  a portable pixmap as input.  Produces an Abekas YUV file as out-
       put.
       yuvtoppm(1), ppm(5)
       Marc Boucher <marc@PostImage.COM>, based on Example Conversion Program,
       A60/A64 Digital Video Interface Manual, page 69.
       Copyright (C) 1991 by DHD PostImage Inc.
       Copyright (C) 1987 by Abekas Video Systems Inc.
                                  25 March 91                      ppmtoyuv(1)