'\"
'\" Generated from file '/usr/obj/ports/tcllib-1.11.1/tcllib-1.11.1/modules/tiff/tiff.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2005-2006, Aaron Faupell <afaupell@users.sourceforge.net>
'\"
'\" The definitions below are for supplemental macros used in Tcl/Tk
'\" manual entries.
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.TH "tiff" n 0.2.1 tiff "TIFF image manipulation"
.BS
.SH NAME
tiff \- TIFF reading, writing, and querying and manipulation of meta data
.SH SYNOPSIS
package require \fBTcl  8.2\fR
.sp
package require \fBtiff  ?0.2.1?\fR
.sp
\fB::tiff::isTIFF\fR \fIfile\fR
.sp
\fB::tiff::byteOrder\fR \fIfile\fR
.sp
\fB::tiff::numImages\fR \fIfile\fR
.sp
\fB::tiff::dimensions\fR \fIfile\fR ?image?
.sp
\fB::tiff::imageInfo\fR \fIfile\fR ?image?
.sp
\fB::tiff::entries\fR \fIfile\fR ?image?
.sp
\fB::tiff::getEntry\fR \fIfile\fR \fIentry\fR ?image?
.sp
\fB::tiff::addEntry\fR \fIfile\fR \fIentry\fR ?image?
.sp
\fB::tiff::deleteEntry\fR \fIfile\fR \fIentry\fR ?image?
.sp
\fB::tiff::getImage\fR \fIfile\fR ?image?
.sp
\fB::tiff::writeImage\fR \fIimage\fR \fIfile\fR ?entry?
.sp
\fB::tiff::nametotag\fR \fInames\fR
.sp
\fB::tiff::tagtoname\fR \fItags\fR
.sp
\fB::tiff::debug\fR \fIfile\fR
.sp
.BE
.SH DESCRIPTION
.PP
This package provides commands to query, modify, read, and write TIFF images.
TIFF stands for \fITagged Image File Format\fR and is a standard
for lossless storage of photographical images and associated metadata.
It is specified at \fIhttp://partners.adobe.com/public/developer/tiff/index.html\fR.
.PP
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
\fIhttp://www.awaresystems.be/imaging/tiff/tifftags.html\fR
.SH COMMANDS
.TP
\fB::tiff::isTIFF\fR \fIfile\fR
Returns a boolean value indicating if \fIfile\fR is a
TIFF image.
.TP
\fB::tiff::byteOrder\fR \fIfile\fR
Returns either \fBbig\fR or \fBlittle\fR.
Throws an error if \fIfile\fR is not a TIFF image.
.TP
\fB::tiff::numImages\fR \fIfile\fR
Returns the number of images in \fIfile\fR.
Throws an error if \fIfile\fR is not a TIFF image.
.TP
\fB::tiff::dimensions\fR \fIfile\fR ?image?
Returns the dimensions of image number ?image? in \fIfile\fR as a list of the
horizontal and vertical pixel count.
Throws an error if \fIfile\fR is not a TIFF image.
.TP
\fB::tiff::imageInfo\fR \fIfile\fR ?image?
Returns a dictionary with keys \fBImageWidth\fR, \fBImageLength\fR,
\fBBitsPerSample\fR, \fBCompression\fR, \fBPhotometricInterpretation\fR,
\fBImageDescription\fR, \fBOrientation\fR, \fBXResolution\fR,
\fBYResolution\fR, \fBResolutionUnit\fR, \fBDateTime\fR, \fBArtist\fR,
and \fBHostComputer\fR. The values are the associated properties of
the TIFF ?image? in \fIfile\fR. Values may be empty if the associated tag is not
present in the file.
.nf

    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 {}

.fi
There is nothing special about these tags, this is simply a convience procedure which calls
\fBgetEntry\fR with common entries.
Throws an error if \fIfile\fR is not a TIFF image.
.TP
\fB::tiff::entries\fR \fIfile\fR ?image?
Returns a list of all entries in the given \fIfile\fR and ?image?
in hexadecimal format.
Throws an error if \fIfile\fR is not a TIFF image.
.TP
\fB::tiff::getEntry\fR \fIfile\fR \fIentry\fR ?image?
Returns the value of \fIentry\fR from image ?image? in the TIFF \fIfile\fR.
\fIentry\fR may be a list of multiple entries. If an entry does not exist, an
empty string is returned
.nf

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

.fi
Throws an error if \fIfile\fR is not a TIFF image.
.TP
\fB::tiff::addEntry\fR \fIfile\fR \fIentry\fR ?image?
Adds the specified entries to the image named by ?image? (default 0), or optionally \fBall\fR.
\fIentry\fR must be a list where each element is a list of tag, type, and value. If a tag already
exists, it is overwritten.
.nf

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

.fi
The data types are defined as follows
.RS
.TP
\fB1\fR
BYTE (8 bit unsigned integer)
.TP
\fB2\fR
ASCII
.TP
\fB3\fR
SHORT (16 bit unsigned integer)
.TP
\fB4\fR
LONG (32 bit unsigned integer)
.TP
\fB5\fR
RATIONAL
.TP
\fB6\fR
SBYTE (8 bit signed byte)
.TP
\fB7\fR
UNDEFINED (uninterpreted binary data)
.TP
\fB8\fR
SSHORT (signed 16 bit integer)
.TP
\fB9\fR
SLONG (signed 32 bit integer)
.TP
\fB10\fR
SRATIONAL
.TP
\fB11\fR
FLOAT (32 bit floating point number)
.TP
\fB12\fR
DOUBLE (64 bit floating point number)
.RE
Throws an error if \fIfile\fR is not a TIFF image.
.TP
\fB::tiff::deleteEntry\fR \fIfile\fR \fIentry\fR ?image?
Deletes the specified entries from the image named by ?image? (default 0), or optionally \fBall\fR.
Throws an error if \fIfile\fR is not a TIFF image.
.TP
\fB::tiff::getImage\fR \fIfile\fR ?image?
Returns the name of a Tk image containing the image at index ?image? from \fIfile\fR
Throws an error if \fIfile\fR is not a TIFF image, or if image is an unsupported format.
Supported formats are uncompressed 24 bit RGB and uncompressed 8 bit palette.
.TP
\fB::tiff::writeImage\fR \fIimage\fR \fIfile\fR ?entry?
Writes the contents of the Tk image \fIimage\fR to a tiff file \fIfile\fR. 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 \fBtiff::addEntry\fR
.TP
\fB::tiff::nametotag\fR \fInames\fR
Returns a list with \fInames\fR 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.
.TP
\fB::tiff::tagtoname\fR \fItags\fR
Returns a list with \fItags\fR translated from 4 digit to string format. If a tag does
not have a defined name it is passed through unchanged.
.TP
\fB::tiff::debug\fR \fIfile\fR
Prints everything we know about the given file in a nice format.
.PP
.SH 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.
.SH LIMITATIONS
.IP [1]
Cannot write exif ifd
.IP [2]
Reading limited to uncompressed 8 bit rgb and 8 bit palletized images
.IP [3]
Writing limited to uncompressed 8 bit rgb
.PP
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems.
Please report such in the category \fItiff\fR of the
\fITcllib SF Trackers\fR [http://sourceforge.net/tracker/?group_id=12883].
Please also report any ideas for enhancements you may have for either
package and/or documentation.
.SH KEYWORDS
image, tif, tiff
.SH COPYRIGHT
.nf
Copyright (c) 2005-2006, Aaron Faupell <afaupell@users.sourceforge.net>

.fi