1Pamfile User Manual(0) Pamfile User Manual(0)
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6 pamfile - describe a Netpbm (PAM or PNM) file
7
10 pamfile
11 [-allimages] [-comments] [-count] [-machine] [-size]
13 [file ...]
15 Minimum unique abbreviations of options are acceptable. You may use
17 double hyphens instead of single hyphen to denote options. You may use
18 white space in place of the equals sign to separate an option name from
19 its value.
20
23 This program is part of Netpbm(1).
24 pamfile reads one or more Netpbm files as input and writes out short
26 descriptions of the image type, size, etc. This is partly for use in
27 shell scripts, so the format is not particularly pretty.
28 By default, pamfile reads only the header of the input file. If that
30 file is a pipe, that might cause problems for the process that is feed‐
31 ing the pipe. In that case, see the -allimages option.
32
35 In addition to the options common to all programs based on libnetpbm
36 (most notably -quiet, see
37 Common Options ⟨index.html#commonoptions⟩ ), pamfile recognizes the
38 following command line options:
39 -allimages
43 This option causes pamfile to describe every image in each input
44 file. Without this option, pamfile describes only the first
45 image in each input file.
46 This option also causes pamfile to read all the images from the
48 input stream, whereas without it, pamfile reads only the header
49 of the first one. If the input stream is from a pipe, the
50 process that is feeding the pipe might require the entire stream
51 to be consumed. In that case, use this option even if the
52 stream contains only one image.
53 This option has no effect if you also specify -count.
55 Note that before July 2000, a file could not contain more than
57 one image and many programs ignore all but the first.
58 This option was new in Netpbm 9.5 (July 2000).
60 -comments
63 This option causes pamfile to include for each PAM image a
64 report of the comments from the header of the image.
65 For a PBM, PGM, or PPM image, pamfile reports there are no com‐
67 ments, even if there are.
68 This option was new in Netpbm 10.35 (August 2006).
70 -count This option causes pamfile to display only a count of how many
73 images are in each input file.
74 As with -allimages, this causes pamfile to read all the images.
76 You may specify at most one of -count, -machine, and -size.
78 This option was new with Netpbm 10.31 (December 2005).
80 -machine
83 This makes the output more convenient for a machine to use,
84 while
85 less convenient for a human. pamfile reports the same infor‐
86 mation
87 as with no options.
88 The output is one line of ASCII text per image. Each line con‐
90 sists of
91 the file name, followed by a colon, followed by a space,
92 then the
93 following tokens with a space in between:
94 · Format: 'PAM', 'PBM', 'PGM', or
98 'PPM',
99 · Subformat: 'PLAIN' or 'RAW'
101 · Width: in pixels, in decimal
103 · Height: in pixels, in decimal
105 · Depth: in decimal
107 · Maxval: in decimal (1 if image is PBM)
109 · Tuple type (emulated if the image is not PAM)
111 You may specify at most one of -count, -machine, and -size.
114 This option was new in Netpbm 10.86 (March 2019).
116 -size This makes the output contain only the height and width of the
119 image, in a form convenient for machine processing.
120 There is one line of output per image, consising of two blank-
122 delimited tokens:
123 · Width: in pixels, in decimal
127 · Height: in pixels, in decimal
129 Note that there is no way to tell which image is in which file,
132 if you have multiple input files with multiple images. If that
133 is your case, use -machine instead.
134 You may specify at most one of -count, -machine, and -size.
136 This option was new in Netpbm 10.86 (March 2019).
138
143 pam(1), ppmhist(1), file
144
147 Copyright (C) 1991 by Jef Poskanzer.
148
150 This manual page was generated by the Netpbm tool 'makeman' from HTML
151 source. The master documentation is at
152 http://netpbm.sourceforge.net/doc/pamfile.html
154netpbm documentation 04 July 2020 Pamfile User Manual(0)