1exif(n)                          EXIF parsing                          exif(n)
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NAME

8       exif - Tcl EXIF extracts and parses EXIF fields from digital images
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SYNOPSIS

11       package require Tcl  8.2
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13       package require exif  ?1.1.2?
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15       exif::analyze channel ?thumbnail?
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17       exif::analyzeFile filename ?thumbnail?
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19       exif::fieldnames
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DESCRIPTION

24       The EXIF package is a recoding of Chris Breeze's Perl package to do the
25       same thing.  This version accepts a channel  as  input  and  returns  a
26       serialized array with all the recognised fields parsed out.
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28       There  is  also a function to obtain a list of all possible field names
29       that might be present, which is useful in building  GUIs  that  present
30       such information.
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COMMANDS

33       exif::analyze channel ?thumbnail?
34              channel  should be an open file handle rewound to the start.  It
35              does not need to be seekable.  channel will  be  set  to  binary
36              mode  and is left wherever it happens to stop being parsed, usu‐
37              ally at the end of the file or the start of the image data.  You
38              must open and close the stream yourself.  If no error is thrown,
39              the return value is a serialized array with informative  English
40              text  about  what  was  found in the EXIF block.  Failure during
41              parsing or I/O throw errors.
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43              If thumbnail is present and not the  empty  string  it  will  be
44              interpreted  as the name of a file, and the thumbnail image con‐
45              tained in the exif data will be written into it.
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47       exif::analyzeFile filename ?thumbnail?
48              This is a file-based wrapper around  exif::analyze.  Instead  of
49              taking a stream it takes a filename and analyzes the contents of
50              the specified file.
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52       exif::fieldnames
53              This returns a list of all possible field names.  That  is,  the
54              array  returned  by exif::analyze will not contain keys that are
55              not listed in the return from exif::fieldnames.  Of  course,  if
56              information  is missing in the image file, exif::analyze may not
57              return all the fields listed in  the  return  from  exif::field‐
58              names.   This  function  is  expected to be primarily useful for
59              building GUIs to display results.
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61              N.B.: Read the implementation of exif::fieldnames before modify‐
62              ing the implementation of exif::analyze.
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COPYRIGHTS

65       (c)  2002  Darren  New  Hold harmless the author, and any lawful use is
66       allowed.
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ACKNOWLEDGEMENTS

69       This code is a direct translation of version 1.3 of  exif.pl  by  Chris
70       Breeze.  See the source for full headers, references, etc.
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74exif                                 1.1.2                             exif(n)
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