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)