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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 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.
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 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(5)
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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