Pamchannel User Manual(0)			     Pamchannel User Manual(0)



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 dou-
       ble 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 PAM or PNM image as input and produces a  PAM	 image
       as output, consisting of the indicated channels (planes) of the input.

       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
       -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  usu-
	      ally have the input file specification as an argument.  For pam-
	      channel, 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 rec-
	      ognize 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).



netpbm documentation		10 January 2006	     Pamchannel User Manual(0)