Rawtoppm User Manual(1) General Commands Manual Rawtoppm User Manual(1)
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 out-
put. 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 resulting PPM is upside down, so run it
through pamflip -tb.
OPTIONS
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see ]8;;index.html#commonoptions\ Common Options]8;;\ ), rawtoppm recognizes the
following command line 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 de-
fault 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.
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/rawtoppm.html
netpbm documentation 06 February 1991 Rawtoppm User Manual(1)
Generated by dwww version 1.16 on Tue Dec 16 04:51:15 CET 2025.