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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 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 PAM or PNM image as input and produces a PAM image as output, consist-
       ing 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
       -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 num-
	      bers.

       -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).

netpbm documentation			 10 January 2006		Pamchannel User Manual(0)
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