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Rawtoppm User Manual(0)                                Rawtoppm User Manual(0)



NAME
       rawtoppm - convert a stream of raw RGB bytes to a PPM image


SYNOPSIS
       rawtoppm

       [-headerskip N]

       [-rowskip N]

       [ -rgb|-rbg|-grb |-gbr|-brg|-bgr ]

       [-interpixel|-interrow] width height

       [imagedata]


DESCRIPTION
       This program is part of Netpbm(1).

       rawtoppm  reads  raw  RGB bytes as input and produces a PPM image 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.  rawtoppm assumes the maxval of the input samples is 255, and makes the maxval of the output PPM 255.

       rawtoppm assumes the pixels come top first in the input stream.  If they are actually bottom first, the result-
       ing PPM is upside down, so run it through pamflip -tb.


OPTIONS
       -headerskip
              Skip over this many bytes at the beginning of the input stream.  Use this option when the input has some
              kind of header followed by a raster suitable for rawtoppm.


       -rowskip
              Skip this many bytes at the end of each row of the raster.  (Some input streams have padding at the  end
              of rows).


       -rgb -rbg -grb -gbr -brg -bgr
              This option specifies the order of the color components for each pixel.  The default is -rgb.


       -interpixel -interrow
              These  options  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 option - 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(1), rawtopgm(1), rgb3toppm(1), pamflip(1)


AUTHOR
       Copyright (C) 1991 by Jef Poskanzer.



netpbm documentation           06 February 1991        Rawtoppm User Manual(0)