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tiff(3tcl)

NAME

   tiff  -  TIFF  reading,  writing, and querying and manipulation of meta
   data

SYNOPSIS

   package require Tcl  8.2

   package require tiff  ?0.2.1?

   ::tiff::isTIFF file

   ::tiff::byteOrder file

   ::tiff::numImages file

   ::tiff::dimensions file ?image?

   ::tiff::imageInfo file ?image?

   ::tiff::entries file ?image?

   ::tiff::getEntry file entry ?image?

   ::tiff::addEntry file entry ?image?

   ::tiff::deleteEntry file entry ?image?

   ::tiff::getImage file ?image?

   ::tiff::writeImage image file ?entry?

   ::tiff::nametotag names

   ::tiff::tagtoname tags

   ::tiff::debug file

______________________________________________________________________________

DESCRIPTION

   This package provides commands to query, modify, read, and  write  TIFF
   images.  TIFF stands for Tagged Image File Format and is a standard for
   lossless storage of photographical images and associated metadata.   It
   is                             specified                             at
   http://partners.adobe.com/public/developer/tiff/index.html.

   Multiple images may be stored  in  a  single  TIFF  file.  The  ?image?
   options to the functions in this package are for accessing images other
   than the first. Data in a TIFF image is stored  as  a  series  of  tags
   having  a  numerical  value,  which are represented in either a 4 digit
   hexadecimal format or a string name. For a reference  on  defined  tags
   and                  their                 meanings                 see
   http://www.awaresystems.be/imaging/tiff/tifftags.html

COMMANDS

::tiff::isTIFF file
Returns a boolean value indicating if file is a TIFF image.

::tiff::byteOrder file
Returns either big or little. Throws an error if file is not a
TIFF image.

::tiff::numImages file
Returns the number of images in file. Throws an error if file
is not a TIFF image.

::tiff::dimensions file ?image?
Returns the dimensions of image number ?image? in file as a list
of the horizontal and vertical pixel count. Throws an error if
file is not a TIFF image.

::tiff::imageInfo file ?image?
Returns a dictionary with keys ImageWidth, ImageLength,
BitsPerSample, Compression, PhotometricInterpretation,
ImageDescription, Orientation, XResolution, YResolution,
ResolutionUnit, DateTime, Artist, and HostComputer. The values
are the associated properties of the TIFF ?image? in file.
Values may be empty if the associated tag is not present in the
file.

puts [::tiff::imageInfo photo.tif]

ImageWidth 686 ImageLength 1024 BitsPerSample {8 8 8} Compression 1
PhotometricInterpretation 2 ImageDescription {} Orientation 1
XResolution 170.667 YResolution 170.667 ResolutionUnit 2 DateTime {2005:12:28 19:44:45}
Artist {} HostComputer {}

There is nothing special about these tags, this is simply a
convience procedure which calls getEntry with common entries.
Throws an error if file is not a TIFF image.

::tiff::entries file ?image?
Returns a list of all entries in the given file and ?image? in
hexadecimal format. Throws an error if file is not a TIFF
image.

::tiff::getEntry file entry ?image?
Returns the value of entry from image ?image? in the TIFF file.
entry may be a list of multiple entries. If an entry does not
exist, an empty string is returned

set data [::tiff::getEntry photo.tif {0131 0132}]
puts "file was written at [lindex $data 0] with software [lindex $data 1]"

Throws an error if file is not a TIFF image.

::tiff::addEntry file entry ?image?
Adds the specified entries to the image named by ?image?
(default 0), or optionally all. entry must be a list where each
element is a list of tag, type, and value. If a tag already
exists, it is overwritten.

::tiff::addEntry photo.tif {{010e 2 "an example photo"} {013b 2 "Aaron F"}}

The data types are defined as follows

1 BYTE (8 bit unsigned integer)

2 ASCII

3 SHORT (16 bit unsigned integer)

4 LONG (32 bit unsigned integer)

5 RATIONAL

6 SBYTE (8 bit signed byte)

7 UNDEFINED (uninterpreted binary data)

8 SSHORT (signed 16 bit integer)

9 SLONG (signed 32 bit integer)

10 SRATIONAL

11 FLOAT (32 bit floating point number)

12 DOUBLE (64 bit floating point number)

Throws an error if file is not a TIFF image.

::tiff::deleteEntry file entry ?image?
Deletes the specified entries from the image named by ?image?
(default 0), or optionally all. Throws an error if file is not
a TIFF image.

::tiff::getImage file ?image?
Returns the name of a Tk image containing the image at index
?image? from file Throws an error if file is not a TIFF image,
or if image is an unsupported format. Supported formats are
uncompressed 24 bit RGB and uncompressed 8 bit palette.

::tiff::writeImage image file ?entry?
Writes the contents of the Tk image image to a tiff file file.
Files are written in the 24 bit uncompressed format, with big
endian byte order. Additional entries to be added to the image
may be specified, in the same format as tiff::addEntry

::tiff::nametotag names
Returns a list with names translated from string to 4 digit
format. 4 digit names in the input are passed through unchanged.
Strings without a defined tag name will throw an error.

::tiff::tagtoname tags
Returns a list with tags translated from 4 digit to string
format. If a tag does not have a defined name it is passed
through unchanged.

::tiff::debug file
Prints everything we know about the given file in a nice format.

VARIABLES

   The  mapping  of  4  digit  tag  names  to  string names uses the array
   ::tiff::tiff_tags.    The    reverse    mapping    uses    the    array
   ::tiff::tiff_sgat.

LIMITATIONS

   [1]    Cannot write exif ifd

   [2]    Reading  limited  to uncompressed 8 bit rgb and 8 bit palletized
          images

   [3]    Writing limited to uncompressed 8 bit rgb

BUGS, IDEAS, FEEDBACK

   This document, and the package it describes, will  undoubtedly  contain
   bugs  and  other  problems.  Please report such in the category tiff of
   the  Tcllib  Trackers  [http://core.tcl.tk/tcllib/reportlist].   Please
   also  report any ideas for enhancements you may have for either package
   and/or documentation.

KEYWORDS

   image, tif, tiff

COPYRIGHT

   Copyright (c) 2005-2006, Aaron Faupell <afaupell@users.sourceforge.net>

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