Updated: 06 February 1991
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rawtoppm - convert a stream of raw RGB bytes to a PPM image
[-interpixel|-interrow] width height
This program is part of Netpbm.
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
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.
- 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.
- 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.
Copyright (C) 1991 by Jef Poskanzer.
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