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[manpage_begin tiff n 0.2.1]
[keywords image]
[keywords tif]
[keywords tiff]
[copyright {2005-2006, Aaron Faupell <afaupell@users.sourceforge.net>}]
[moddesc {TIFF image manipulation}]
[titledesc {TIFF reading, writing, and querying and manipulation of meta data}]
[category {File formats}]
[require Tcl 8.2]
[require tiff [opt 0.2.1]]
[description]
[para]
This package provides commands to query, modify, read, and write TIFF images.
TIFF stands for [term {Tagged Image File Format}] and is a standard
for lossless storage of photographical images and associated metadata.
It is specified at [uri http://partners.adobe.com/public/developer/tiff/index.html].
[para]
Multiple images may be stored in a single TIFF file. The [opt 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
[uri http://www.awaresystems.be/imaging/tiff/tifftags.html]
[section COMMANDS]
[list_begin definitions]
[call [cmd ::tiff::isTIFF] [arg file]]
Returns a boolean value indicating if [arg file] is a
TIFF image.
[call [cmd ::tiff::byteOrder] [arg file]]
Returns either [const big] or [const little].
Throws an error if [arg file] is not a TIFF image.
[call [cmd ::tiff::numImages] [arg file]]
Returns the number of images in [arg file].
Throws an error if [arg file] is not a TIFF image.
[call [cmd ::tiff::dimensions] [arg file] [opt image]]
Returns the dimensions of image number [opt image] in [arg file] as a list of the
horizontal and vertical pixel count.
Throws an error if [arg file] is not a TIFF image.
[call [cmd ::tiff::imageInfo] [arg file] [opt image]]
Returns a dictionary with keys [const ImageWidth], [const ImageLength],
[const BitsPerSample], [const Compression], [const PhotometricInterpretation],
[const ImageDescription], [const Orientation], [const XResolution],
[const YResolution], [const ResolutionUnit], [const DateTime], [const Artist],
and [const HostComputer]. The values are the associated properties of
the TIFF [opt image] in [arg file]. Values may be empty if the associated tag is not
present in the file.
[example {
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
[cmd getEntry] with common entries.
Throws an error if [arg file] is not a TIFF image.
[call [cmd ::tiff::entries] [arg file] [opt image]]
Returns a list of all entries in the given [arg file] and [opt image]
in hexadecimal format.
Throws an error if [arg file] is not a TIFF image.
[call [cmd ::tiff::getEntry] [arg file] [arg entry] [opt image]]
Returns the value of [arg entry] from image [opt image] in the TIFF [arg file].
[arg entry] may be a list of multiple entries. If an entry does not exist, an
empty string is returned
[example {
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 [arg file] is not a TIFF image.
[call [cmd ::tiff::addEntry] [arg file] [arg entry] [opt image]]
Adds the specified entries to the image named by [opt image] (default 0), or optionally [const all].
[arg entry] must be a list where each element is a list of tag, type, and value. If a tag already
exists, it is overwritten.
[example {
::tiff::addEntry photo.tif {{010e 2 "an example photo"} {013b 2 "Aaron F"}}
}]
The data types are defined as follows
[list_begin definitions]
[def [const 1]] BYTE (8 bit unsigned integer)
[def [const 2]] ASCII
[def [const 3]] SHORT (16 bit unsigned integer)
[def [const 4]] LONG (32 bit unsigned integer)
[def [const 5]] RATIONAL
[def [const 6]] SBYTE (8 bit signed byte)
[def [const 7]] UNDEFINED (uninterpreted binary data)
[def [const 8]] SSHORT (signed 16 bit integer)
[def [const 9]] SLONG (signed 32 bit integer)
[def [const 10]] SRATIONAL
[def [const 11]] FLOAT (32 bit floating point number)
[def [const 12]] DOUBLE (64 bit floating point number)
[list_end]
Throws an error if [arg file] is not a TIFF image.
[call [cmd ::tiff::deleteEntry] [arg file] [arg entry] [opt image]]
Deletes the specified entries from the image named by [opt image] (default 0), or optionally [const all].
Throws an error if [arg file] is not a TIFF image.
[call [cmd ::tiff::getImage] [arg file] [opt image]]
Returns the name of a Tk image containing the image at index [opt image] from [arg file]
Throws an error if [arg 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.
[call [cmd ::tiff::writeImage] [arg image] [arg file] [opt entry]]
Writes the contents of the Tk image [arg image] to a tiff file [arg 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 [cmd tiff::addEntry]
[call [cmd ::tiff::nametotag] [arg names]]
Returns a list with [arg 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.
[call [cmd ::tiff::tagtoname] [arg tags]]
Returns a list with [arg tags] translated from 4 digit to string format. If a tag does
not have a defined name it is passed through unchanged.
[call [cmd ::tiff::debug] [arg file]]
Prints everything we know about the given file in a nice format.
[list_end]
[section 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.
[section LIMITATIONS]
[list_begin enumerated]
[enum] Cannot write exif ifd
[enum] Reading limited to uncompressed 8 bit rgb and 8 bit palletized images
[enum] Writing limited to uncompressed 8 bit rgb
[list_end]
[vset CATEGORY tiff]
[include ../doctools2base/include/feedback.inc]
[manpage_end]
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