NAME

       pamfile - describe a Netpbm (PAM or PNM) file

SYNOPSIS

       pamfile

       [-allimages] [-comments] [-count] [-machine] [-size]

       [file ...]

       Minimum  unique  abbreviations  of  options are 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).

       pamfile  reads  one  or  more  Netpbm files as input and writes out short descriptions of the image type,
       size, etc.  This is partly for use in shell scripts, so the format is not particularly pretty.

       By default, pamfile reads only the header of the input file.  If that file is a pipe,  that  might  cause
       problems for the process that is feeding the pipe.  In that case, see the -allimages option.

OPTIONS

       In addition to the options common to all programs based on libnetpbm (most notably -quiet, see
        Common Options ⟨index.html#commonoptions⟩ ), pamfile recognizes the following command line options:

       -allimages
              This  option  causes  pamfile  to  describe  every image in each input file.  Without this option,
              pamfile describes only the first image in each input file.

              This option also causes pamfile to read all the images from the input stream, whereas without  it,
              pamfile  reads  only the header of the first one.  If the input stream is from a pipe, the process
              that is feeding the pipe might require the entire stream to be consumed.  In that case,  use  this
              option even if the stream contains only one image.

              This option has no effect if you also specify -count.

              Note  that before July 2000, a file could not contain more than one image and many programs ignore
              all but the first.

              This option was new in Netpbm 9.5 (July 2000).

       -comments
              This option causes pamfile to include for each PAM image a report of the comments from the  header
              of the image.

              For a PBM, PGM, or PPM image, pamfile reports there are no comments, even if there are.

              This option was new in Netpbm 10.35 (August 2006).

       -count This option causes pamfile to display only a count of how many images are in each input file.

              As with -allimages, this causes pamfile to read all the images.

              You may specify at most one of -count, -machine, and -size.

              This option was new with Netpbm 10.31 (December 2005).

       -machine
              This makes the output more convenient for a machine to use, while
                less convenient for a human.  pamfile reports the same information
                as with no options.

              The output is one line of ASCII text per image.  Each line consists of
                   the file name, followed by a colon, followed by a space, then the
                   following tokens with a space in between:

       •      Format: 'PAM', 'PBM', 'PGM', or
                      'PPM',

       •      Subformat: 'PLAIN' or 'RAW'

       •      Width: in pixels, in decimal

       •      Height: in pixels, in decimal

       •      Depth: in decimal

       •      Maxval: in decimal (1 if image is PBM)

       •      Tuple type (emulated if the image is not PAM)

              You may specify at most one of -count, -machine, and -size.

              This option was new in Netpbm 10.86 (March 2019).

       -size  This  makes  the  output  contain only the height and width of the image, in a form convenient for
              machine processing.

              There is one line of output per image, consisting of two blank-delimited tokens:

       •      Width: in pixels, in decimal

       •      Height: in pixels, in decimal

              Note that there is no way to tell which image is in which file, if you have multiple  input  files
              with multiple images.  If that is your case, use -machine instead.

              You may specify at most one of -count, -machine, and -size.

              This option was new in Netpbm 10.86 (March 2019).

SEE ALSO

       pam(1), ppmhist(1), file

AUTHOR

       Copyright (C) 1991 by Jef Poskanzer.

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/pamfile.html