rawtoppm Man page

rawtoppm General Commands Manual rawtoppm


rawtoppm – convert raw RGB bytes into a portable pixmap


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


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 .


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

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 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.


ppm(5), rawtopgm, rgb3toppm, pnmflip


Copyright (C) 1991 by Jef Poskanzer.

06 February 1991 rawtoppm