Exclude the header row while splitting the file

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rawtoppm

rawtoppm(1)						      General Commands Manual						       rawtoppm(1)

NAME

       rawtoppm - convert raw RGB bytes into a portable pixmap

SYNOPSIS

       rawtoppm [-headerskip N] [-rowskip N] [-rgb|-rbg|-grb |-gbr|-brg|-bgr ] [-interpixel|-interrow] width height [imagedata]

DESCRIPTION

       Reads  raw RGB bytes as input.  Produces a portable pixmap as output.  The input file is just RGB bytes.  You have to specify the width and
       height on the command line, since the program obviously can't get them from the file.  The maxval is assumed to be 255.	If  the  resulting
       image is upside down, run it through pnmflip -tb .

OPTIONS

       -headerskip
	      If the file has a header, you can use this flag to skip over it.

       -rowskip
	      If there is padding at the ends of the rows, you can skip it with this flag.

       -rgb -rbg -grb -gbr -brg -bgr
	      These flags let you specify alternate color orders.  The default is -rgb.

       -interpixel -interrow
	      These  flags  let  you specify how the colors are interleaved.  The default is -interpixel, meaning interleaved by pixel.  A byte of
	      red, a byte of green, and a byte of blue, or whatever color order you specified.	-interrow means interleaved by row - a row of red,
	      a  row  of  green, a row of blue, assuming standard rgb color order.  An -interplane flag  - all the red pixels, then all the green,
	      then all the blue - would be an obvious extension, but is not implemented.  You could get the same effect by splitting the file into
	      three parts (perhaps using dd), turning each part into a PGM file with rawtopgm, and then combining them with rgb3toppm.

SEE ALSO

       ppm(5), rawtopgm(1), rgb3toppm(1), pnmflip(1)

AUTHOR

       Copyright (C) 1991 by Jef Poskanzer.

								 06 February 1991						       rawtoppm(1)

Shell Programming and Scripting