1Pamstack User Manual(0)                                Pamstack User Manual(0)
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NAME

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

10       pamstack [-tupletype tupletype] [inputfilespec ...]
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12       All  options may be abbreviated to the shortest unique prefix.  You may
13       use two hyphens instead of one.  You may separate an  option  from  its
14       value with a space instead of =.
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DESCRIPTION

18       This program is part of Netpbm(1).
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20       pamstack  reads  multiple PAM or PNM images as input and produces a PAM
21       image as output, consisting of all the planes (channels) of the inputs,
22       stacked in the order specified.
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24       For  any  one (but not more) of the input files, you may specify "-" to
25       mean Standard Input.  If you specify no arguments at all, the input  is
26       one file: Standard Input.
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28       The  output is the same dimensions as the inputs, except that the depth
29       is the sum of the depths of the inputs.  It has the same maxval.   pam‐
30       stack  fails if the inputs are not all the same width, height, and max‐
31       val.  The tuple type is a null string unless you specify the -tupletype
32       option.
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34       pamstack  works  with  multi-image streams.  It stacks the 1st image in
35       all the streams into one output image (the  first  one  in  the  output
36       stream),  then  stacks  the  2nd  image in all the streams into the 2nd
37       image in the output stream, and so on, until one of  the  streams  runs
38       dry.  It's like a matrix operation.
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40       Before Netpbm 10.32 (February 2006), pamstack ignored all but the first
41       image in each input stream.
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43       pamchannel does the  opposite  of  pamstack:   It  extracts  individual
44       planes from a single PAM.
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46       Use  pamtopnm(1)  to convert a suitable PAM image to a more traditional
47       PNM (PBM, PGM, or PPM) image.  (But there's  no  need  to  do  that  if
48       you're  going  to  feed  it to a modern Netpbm program -- they all take
49       suitable PAM input directly).
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51       One example of using pamstack is that some Netpbm  programs  accept  as
52       input  a  PAM  that represents graphic image with transparency informa‐
53       tion.  Taking a color image for example, this would be a PAM with tuple
54       type  "RGB_ALPHA".   In  Netpbm,  such images were traditionally repre‐
55       sented as two images - a PPM for the color and a  PGM  for  the  trans‐
56       parency.   To  convert  a  PPM/PGM  pair into PAM(RGB_ALPHA) input that
57       newer programs require, do something like this:
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59       $ pamstack -tupletype=RGB_ALPHA myimage.ppm myalpha.pgm | \
60             pamtouil >myimage.uil
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OPTIONS

64       -tupletype tupletype
65              This specifies the tuple type name to be recorded in the output.
66              You may use any string up to 255 characters.  Some programs rec‐
67              ognize some names.  If you omit this option, the  default  tuple
68              type name is null.
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SEE ALSO

73       pam(1) pamchannel(1)
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HISTORY

77       pamstack was new in Netpbm 10.0 (June 2002).
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DOCUMENT SOURCE

80       This  manual  page was generated by the Netpbm tool 'makeman' from HTML
81       source.  The master documentation is at
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83              http://netpbm.sourceforge.net/doc/pamstack.html
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85netpbm documentation            10 January 2006        Pamstack User Manual(0)