NAME

       ppmtoyuvsplit - convert a PPM image to 3 subsampled raw YUV files

SYNOPSIS

       ppmtoyuvsplit basename [ppmfile]

DESCRIPTION

       This program is part of Netpbm(1).

       ppmtoyuvsplit reads a PPM image as input.  Produces 3 raw files basename.Y, basename.U and
       basename.V as output.

       The output files are the subsampled raw YUV representation of  the  input  PPM  image,  as
       required  by the Stanford MPEG codec.  The Y output file contains a byte for each pixel in
       the image, with the rows going from top to bottom and the columns within  each  row  going
       left  to  right.   The  U and V output files are arranged similarly, except that each byte
       represents a square of 4 pixels of the image.  The value is the  arithmetic  mean  of  the
       value  for each of those 4 pixels.  Hence, the Y file is 4 times the size of the U file or
       V file.

       The YUV values are scaled according to CCIR.601, as assumed by MPEG.

OPTIONS

       There are  no  command  line  options  defined  specifically  for  ppmtoyuvsplit,  but  it
       recognizes the options common to all programs based on libnetpbm (See
        Common Options ⟨index.html#commonoptions⟩ .)

SEE ALSO

       yuvsplittoppm(1), ppmtoyuv(1), ppmtoeyuv(1), ppmtompeg(1), ppm(1)

AUTHOR

       Copyright (C) 1993 by Andre Beck. (Andre_Beck@IRS.Inf.TU-Dresden.de)

       Based on ppmtoyuv.c

DOCUMENT SOURCE

       This  manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master
       documentation is at

              http://netpbm.sourceforge.net/doc/ppmtoyuvsplit.html