pamstack


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 out-
       put, 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.   pam-
       stack  fails if the inputs are not all the same width, height, and max-
       val. 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 repre-
       sented as two images - a PPM for the color and a  PGM  for  the  trans-
       parency. To convert a PPM/PGM pair into PAM(RGBA) input that newer pro-
       grams require, do something like this:

       pamstack -tupletype=RGBA  myimage.ppm  myalpha.pgm  |  pamtouil  >myim-
       age.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  rec-
              ognize  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)
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