pamstack - stack planes of multiple PAM images into one PAM image


   pamstack [-tupletype tupletype] [inputfilespec]

   All options may be abbreviated to the shortest unique prefix.


   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


   -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.




   Copyright (C) by Bryan Henderson, San Jose CA 2000.08.05

                              01 May 2002                      pamstack(1)

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