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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 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
-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 exten-
sion, 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) , pamflip(1)
AUTHOR
Copyright (C) 1991 by Jef Poskanzer.
netpbm documentation 06 February 1991 Rawtoppm User Manual(0)
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