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<!-- Creator : groff version 1.18.1 -->
<!-- CreationDate: Sat Feb 24 17:59:57 2007 -->
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta name="Content-Style" content="text/css">
<title>TIFFGetField</title>
</head>
<body>
<h1 align=center>TIFFGetField</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#AUTOREGISTERED TAGS">AUTOREGISTERED TAGS</a><br>
<a href="#RETURN VALUES">RETURN VALUES</a><br>
<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<a name="NAME"></a>
<h2>NAME</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p>TIFFGetField, TIFFVGetField &minus; get the value(s) of a
tag in an open <small>TIFF</small> file</p>
</td>
</table>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p><b>#include &lt;tiffio.h&gt;</b></p>
<!-- INDENTATION -->
<p><b>int TIFFGetField(TIFF *</b><i>tif</i><b>, ttag_t</b>
<i>tag</i><b>,</b> <i>...</i><b>)</b></p>
<!-- INDENTATION -->
<p><b>#include &lt;stdarg.h&gt;</b></p>
<!-- INDENTATION -->
<p><b>int TIFFVGetField(TIFF *</b><i>tif</i><b>, ttag_t</b>
<i>tag</i><b>, va_list</b> <i>ap</i><b>)<br>
int TIFFGetFieldDefaulted(TIFF *</b><i>tif</i><b>,
ttag_t</b> <i>tag</i><b>,</b> <i>...</i><b>)<br>
int TIFFVGetFieldDefaulted(TIFF *</b><i>tif</i><b>,
ttag_t</b> <i>tag</i><b>, va_list</b> <i>ap</i><b>)</b></p>
</td>
</table>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p><i>TIFFGetField</i> returns the value of a tag or
pseudo-tag associated with the the current directory of the
opened <small>TIFF</small> file <i>tif</i>. (A
<i>pseudo-tag</i> is a parameter that is used to control the
operation of the <small>TIFF</small> library but whose value
is not read or written to the underlying file.) The file
must have been previously opened with
<i>TIFFOpen</i>(3TIFF). The tag is identified by <i>tag</i>,
one of the values defined in the include file <b>tiff.h</b>
(see also the table below). The type and number of values
returned is dependent on the tag being requested. The
programming interface uses a variable argument list as
prescribed by the <i>stdarg</i>(3) interface. The returned
values should only be interpreted if <i>TIFFGetField</i>
returns 1.</p>
<!-- INDENTATION -->
<p><i>TIFFVGetField</i> is functionally equivalent to
<i>TIFFGetField</i> except that it takes a pointer to a
variable argument list. <i>TIFFVGetField</i> is useful for
layering interfaces on top of the functionality provided by
<i>TIFFGetField</i>.</p>
<!-- INDENTATION -->
<p><i>TIFFGetFieldDefaulted</i> and
<i>TIFFVGetFieldDefaulted</i> are identical to
<i>TIFFGetField</i> and <i>TIFFVGetField</i>, except that if
a tag is not defined in the current directory and it has a
default value, then the default value is returned.</p>
<!-- INDENTATION -->
<p>The tags understood by <i>libtiff(3TIFF),</i> the number
of parameter values, and the types for the returned values
are shown below. The data types are specified as in C and
correspond to the types used to specify tag values to
<i>TIFFSetField</i>(3TIFF). Remember that
<i>TIFFGetField</i> returns parameter values, so all the
listed data types are pointers to storage where values
should be returned. Consult the <small>TIFF</small>
specification (or relevant industry specification) for
information on the meaning of each tag and their possible
values.</p></td>
</table>
<!-- TABS -->
<p><i>Tag Name Count Types Notes</i></p>
<!-- TABS -->
<table width="100%" border=0 rules="none" frame="void"
cols="5" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_ARTIST</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_BADFAXLINES</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_BITSPERSAMPLE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_CLEANFAXDATA</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_COLORMAP</p>
</td>
<td width="8%">
<p>3</p>
</td>
<td width="23%">
<p>uint16**</p>
</td>
<td width="17%">
<p>1&lt;&lt;BitsPerSample arrays</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_COMPRESSION</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_CONSECUTIVEBADFAXLINES</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_COPYRIGHT</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_DATATYPE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_DATETIME</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_DOCUMENTNAME</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_DOTRANGE</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_EXTRASAMPLES</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint16*,uint16**</p>
</td>
<td width="17%">
<p>count &amp; types array</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_FAXFILLFUNC</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>TIFFFaxFillFunc*</p>
</td>
<td width="17%">
<p>G3/G4 compression pseudo-tag</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_FAXMODE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>int*</p>
</td>
<td width="17%">
<p>G3/G4 compression pseudo-tag</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_FILLORDER</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_GROUP3OPTIONS</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_GROUP4OPTIONS</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_HALFTONEHINTS</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_HOSTCOMPUTER</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_ICCPROFILE</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint32*,void**</p>
</td>
<td width="17%">
<p>count, profile data</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_IMAGEDEPTH</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_IMAGEDESCRIPTION</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_IMAGELENGTH</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_IMAGEWIDTH</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_INKNAMES</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_INKSET</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_JPEGCOLORMODE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>int*</p>
</td>
<td width="17%">
<p>JPEG pseudo-tag</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_JPEGQUALITY</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>int*</p>
</td>
<td width="17%">
<p>JPEG pseudo-tag</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_JPEGTABLES</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint32*,void**</p>
</td>
<td width="17%">
<p>count &amp; tables</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_JPEGTABLESMODE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>int*</p>
</td>
<td width="17%">
<p>JPEG pseudo-tag</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_MAKE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_MATTEING</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_MAXSAMPLEVALUE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_MINSAMPLEVALUE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_MODEL</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_ORIENTATION</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_PAGENAME</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_PAGENUMBER</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_PHOTOMETRIC</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_PHOTOSHOP</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint32*,void**</p>
</td>
<td width="17%">
<p>count, data</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_PLANARCONFIG</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_PREDICTOR</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_PRIMARYCHROMATICITIES</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>float**</p>
</td>
<td width="17%">
<p>6-entry array</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_REFERENCEBLACKWHITE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>float**</p>
</td>
<td width="17%">
<p>2*SamplesPerPixel array</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_RESOLUTIONUNIT</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_RICHTIFFIPTC</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint32*,void**</p>
</td>
<td width="17%">
<p>count, data</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_ROWSPERSTRIP</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_SAMPLEFORMAT</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_SAMPLESPERPIXEL</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_SMAXSAMPLEVALUE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>double*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_SMINSAMPLEVALUE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>double*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_SOFTWARE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_STONITS</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>double**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_STRIPBYTECOUNTS</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_STRIPOFFSETS</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_SUBFILETYPE</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_SUBIFD</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint16*,uint32**</p>
</td>
<td width="17%">
<p>count &amp; offsets array</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_TARGETPRINTER</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>char**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_THRESHHOLDING</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_TILEBYTECOUNTS</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_TILEDEPTH</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_TILELENGTH</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_TILEOFFSETS</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32**</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_TILEWIDTH</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint32*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_TRANSFERFUNCTION</p>
</td>
<td width="8%">
<p>1 or 3&dagger;</p>
</td>
<td width="23%"></td>
<td width="17%">
<p>uint16**1&lt;&lt;BitsPerSample entry arrays</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_WHITEPOINT</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>float**</p>
</td>
<td width="17%">
<p>2-entry array</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_XMLPACKET</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint32*,void**</p>
</td>
<td width="17%">
<p>count, data</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_XPOSITION</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>float*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_XRESOLUTION</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>float*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_YCBCRCOEFFICIENTS</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>float**</p>
</td>
<td width="17%">
<p>3-entry array</p>
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_YCBCRPOSITIONING</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_YCBCRSUBSAMPLING</p>
</td>
<td width="8%">
<p>2</p>
</td>
<td width="23%">
<p>uint16*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_YPOSITION</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>float*</p>
</td>
<td width="17%">
</td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="41%">
<p>TIFFTAG_YRESOLUTION</p>
</td>
<td width="8%">
<p>1</p>
</td>
<td width="23%">
<p>float*&Dagger;</p>
</td>
<td width="17%">
</td>
</table>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p>&dagger; If <i>SamplesPerPixel</i> is one, then a single
array is returned; otherwise three arrays are returned.<br>
&Dagger; The contents of this field are quite complex. See
<i>The ICC Profile Format Specification</i>, Annex B.3
&quot;Embedding ICC Profiles in TIFF Files&quot; (available
at http://www.color.org) for an explanation.</p>
</td>
</table>
<a name="AUTOREGISTERED TAGS"></a>
<h2>AUTOREGISTERED TAGS</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p>If you can&rsquo;t find the tag in the table above that
means this is unsupported tag. But you still be able to read
it&rsquo;s value if you know the data type of that tag. For
example, if you want to read the LONG value from the tag
33424 and ASCII string from the tag 36867 you can use the
following code:</p>
</td>
</table>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="17%"></td>
<td width="82%">
<pre>uint16 count;
void *data;
TIFFGetField(tiff, 33424, &amp;count, &amp;data);
printf(&quot;Tag %d: %d, count %d0, 33424, *(uint32 *)data, count);
TIFFGetField(tiff, 36867, &amp;count, &amp;data);
printf(&quot;Tag %d: %s, count %d0, 36867, (char *)data, count);
</pre>
</td>
</table>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p>is not supported by <b>libtiff(3TIFF),</b> library</p>
</td>
</table>
<a name="RETURN VALUES"></a>
<h2>RETURN VALUES</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p>1 is returned if the tag is defined in the current
directory; otherwise a 0 is returned.</p>
</td>
</table>
<a name="DIAGNOSTICS"></a>
<h2>DIAGNOSTICS</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p>All error messages are directed to the
<b>TIFFError</b>(3TIFF) routine.</p>
<!-- INDENTATION -->
<p><b>Unknown field, tag 0x%x</b>. An unknown tag was
supplied.</p>
</td>
</table>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
<!-- INDENTATION -->
<table width="100%" border=0 rules="none" frame="void"
cols="2" cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="91%">
<p><b>TIFFOpen</b>(3TIFF), <b>TIFFSetField</b>(3TIFF),
<b>TIFFSetDirectory</b>(3TIFF),
<b>TIFFReadDirectory</b>(3TIFF),
<b>TIFFWriteDirectory</b>(3TIFF) <b>libtiff</b>(3TIFF),</p>
<!-- INDENTATION -->
<p>Libtiff library home page:
<b>http://www.remotesensing.org/libtiff/</b></p>
</td>
</table>
<hr>
</body>
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