NAME
pamstack - stack planes of multiple PAM images into one PAM image
SYNOPSIS
pamstack [-tupletype tupletype] [inputfilespec]
All options may be abbreviated to the shortest unique prefix.
DESCRIPTION
Reads multiple PAM or PNM images as input. Produces a PAM image as
output, consisting of all the planes (channels) of the inputs, stacked
in the order specified.
The output is the same dimensions as the inputs, except that the depth
is the sum of the depths of the inputs. It has the same maxval.
pamstack fails if the inputs are not all the same width, height, and
maxval. The tuple type is a null string unless you specify the
-tupletype option.
pamchannel does the opposite of pamstack: It extracts individual planes
from a single PAM.
Use pamtopnm to convert a suitable PAM image to a more traditional PNM
(PBM, PGM, or PPM) image.
One example of using pamstack is that some Netpbm programs accept as
input a PAM that represents graphic image with transparency information
-- tuple type "RGBA". In Netpbm, such images were traditionally
represented as two images - a PPM for the color and a PGM for the
transparency. To convert a PPM/PGM pair into PAM(RGBA) input that newer
programs require, do something like this:
pamstack -tupletype=RGBA myimage.ppm myalpha.pgm | pamtouil
>myimage.uil
OPTIONS
-tupletype tupletype
This specified the tuple type name to be recorded in the output.
You may use any string up to 255 characters. Some programs
recognize some names. If you omit this option, the default tuple
type name is null.
SEE ALSO
pam(5)
AUTHOR
Copyright (C) by Bryan Henderson, San Jose CA 2000.08.05
01 May 2002 pamstack(1)