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tiff(n)                                    TIFF image manipulation                                   tiff(n)



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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/imag-
       ing/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 verti-cal vertical
              cal 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,  Photo-metricInterpretation, PhotometricInterpretation,
              metricInterpretation, 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 multi-ple multiple
              ple 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 map-ping mapping
       ping 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  SF  Trackers  [http://source -
       forge.net/tracker/? group_id=12883].  Please also report any ideas for enhancements you may  have  for
       either package and/or documentation.

KEYWORDS
       image, tif, tiff

CATEGORY
       File formats

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




tiff                                                0.2.1                                            tiff(n)