NAME

       pamchannel - extract channels from a PAM image

SYNOPSIS

       pamchannel [-infile=infile] [-tupletype=tupletype] [channum ...]

       Minimum unique abbreviation of option is acceptable.  You may use double hyphens instead of single hyphen
       to  denote  options.  You may use white space in place of the equals sign to separate an option name from
       its value.

DESCRIPTION

       This program is part of Netpbm(1).

       pamchannel reads a Netpbm image as input and produces a PAM image as output, consisting of the  indicated
       channels (planes) of the input.

       Each  channum  argument  is the number of a channel of the input, with the first channel being zero.  The
       channels in the output are in the order of these arguments.

       The output is the same dimensions as the input, except that the depth is the number of channum  arguments
       you supply.  The tuple type is a null string unless you specify the -tupletype option.

       This  program  works  on multi-image streams, producing a corresponding output stream.  But before Netpbm
       10.32 (February 2006), it ignored every image after the first.

       pamstack does the opposite of pamchannel:  It takes multiple PAM or PNM images as input and stacks  their
       planes (channels) on top of one another to yield a single PAM.

OPTIONS

       In  addition  to  the options common to all programs based on libnetpbm (most notably -quiet, see  Common
       Options ), pamchannel recognizes the following command line options:

       -infile infile
              This specifies the input file, which defaults to Standard Input.  You  may  specify  -  to  select
              Standard Input explicitly.

              This  is  a  little  unconventional  for  Netpbm  programs,  which  usually  have  the  input file
              specification as an argument.  For pamchannel, the arguments are channel numbers.

       -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(1) pamstack(1)

HISTORY

       pamchannel was new, along with the PAM format, in Netpbm 9.7 (August 2000).

DOCUMENT SOURCE

       This  manual  page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation
       is at

              http://netpbm.sourceforge.net/doc/pamchannel.html

netpbm documentation                             10 January 2006                       Pamchannel User Manual(1)