Pamchannel User Manual(1) General Commands Manual Pamchannel User Manual(1) 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 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 ev- ery 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 an- other to yield a single PAM. OPTIONS In addition to the options common to all programs based on libnetpbm (most notably -quiet, see Common Options ⟨index.html#commonoptions⟩ ), 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 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). 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)
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