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<title>TIFFGetField</title>
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<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="#RETURN VALUES">RETURN VALUES</a><br>
<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<!-- Creator : groff version 1.17.2 -->
<!-- CreationDate: Mon Dec 22 00:39:21 2003 -->
<a name="NAME"></a>
<h2>NAME</h2>
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TIFFGetField, TIFFVGetField - get the value(s) of a tag in an open <small>TIFF</small> file</td></table>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
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<b>#include <tiffio.h><br>
int TIFFGetField(TIFF* tif, ttag_t tag,
...)</b></td></table>
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<b>#include <stdarg.h><br>
int TIFFVGetField(TIFF* tif, ttag_t tag, va_list
ap)</b></td></table>
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<b>int TIFFGetFieldDefaulted(TIFF* tif, ttag_t tag, ...)<br>
int TIFFVGetFieldDefaulted(TIFF* tif, ttag_t tag, va_list
ap)</b></td></table>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
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<i>TIFFGetField</i> returns the value of a tag or pseudo-tag
associated with the the current directory of the open
<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>(3T). 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.</td></table>
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<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>.</td></table>
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<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.</td></table>
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cols="2" cellspacing="0" cellpadding="0">
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The tags understood by <i>libtiff</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>(3T). 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 for information on the
meaning of each tag and their possible values.</td></table>
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<pre>
<i>Tag Name Count Types Notes
</i>TIFFTAG_ARTIST 1 char**
TIFFTAG_BADFAXLINES 1 uint32*
TIFFTAG_BITSPERSAMPLE 1 uint16*
TIFFTAG_CLEANFAXDATA 1 uint16*
TIFFTAG_COLORMAP 3 uint16** 1<<BitsPerSample arrays
TIFFTAG_COMPRESSION 1 uint16*
TIFFTAG_CONSECUTIVEBADFAXLINES 1 uint32*
TIFFTAG_COPYRIGHT 1 char**
TIFFTAG_DATATYPE 1 uint16*
TIFFTAG_DATETIME 1 char**
TIFFTAG_DOCUMENTNAME 1 char**
TIFFTAG_DOTRANGE 2 uint16*
TIFFTAG_EXTRASAMPLES 2 uint16*,uint16** count & types array
TIFFTAG_FAXMODE 1 int* G3/G4 compression pseudo-tag
TIFFTAG_FAXFILLFUNC 1 TIFFFaxFillFunc* G3/G4 compression pseudo-tag
TIFFTAG_FILLORDER 1 uint16*
TIFFTAG_GROUP3OPTIONS 1 uint32*
TIFFTAG_GROUP4OPTIONS 1 uint32*
TIFFTAG_HALFTONEHINTS 2 uint16*
TIFFTAG_HOSTCOMPUTER 1 char**
TIFFTAG_IMAGEDEPTH 1 uint32*
TIFFTAG_IMAGEDESCRIPTION 1 char**
TIFFTAG_IMAGELENGTH 1 uint32*
TIFFTAG_IMAGEWIDTH 1 uint32*
TIFFTAG_INKNAMES 1 char**
TIFFTAG_INKSET 1 uint16*
TIFFTAG_JPEGTABLES 2 u_short*,void** count & tables
TIFFTAG_JPEGQUALITY 1 int* JPEG pseudo-tag
TIFFTAG_JPEGCOLORMODE 1 int* JPEG pseudo-tag
TIFFTAG_JPEGTABLESMODE 1 int* JPEG pseudo-tag
TIFFTAG_MAKE 1 char**
TIFFTAG_MATTEING 1 uint16*
TIFFTAG_MAXSAMPLEVALUE 1 uint16*
TIFFTAG_MINSAMPLEVALUE 1 uint16*
TIFFTAG_MODEL 1 char**
TIFFTAG_ORIENTATION 1 uint16*
TIFFTAG_PAGENAME 1 char**
TIFFTAG_PAGENUMBER 2 uint16*
TIFFTAG_PHOTOMETRIC 1 uint16*
TIFFTAG_PLANARCONFIG 1 uint16*
TIFFTAG_PREDICTOR 1 uint16*
TIFFTAG_PRIMARYCHROMATICITIES 1 float** 6-entry array
TIFFTAG_REFERENCEBLACKWHITE 1 float** 2*SamplesPerPixel array
TIFFTAG_RESOLUTIONUNIT 1 uint16*
TIFFTAG_ROWSPERSTRIP 1 uint32*
TIFFTAG_SAMPLEFORMAT 1 uint16*
TIFFTAG_SAMPLESPERPIXEL 1 uint16*
TIFFTAG_SMAXSAMPLEVALUE 1 double*
TIFFTAG_SMINSAMPLEVALUE 1 double*
TIFFTAG_SOFTWARE 1 char**
TIFFTAG_STONITS 1 double**
TIFFTAG_STRIPBYTECOUNTS 1 uint32**
TIFFTAG_STRIPOFFSETS 1 uint32**
TIFFTAG_SUBFILETYPE 1 uint32*
TIFFTAG_SUBIFD 2 uint16*,uint32** count & offsets array
TIFFTAG_TARGETPRINTER 1 char**
TIFFTAG_THRESHHOLDING 1 uint16*
TIFFTAG_TILEBYTECOUNTS 1 uint32**
TIFFTAG_TILEDEPTH 1 uint32*
TIFFTAG_TILELENGTH 1 uint32*
TIFFTAG_TILEOFFSETS 1 uint32**
TIFFTAG_TILEWIDTH 1 uint32*
TIFFTAG_TRANSFERFUNCTION 1 or 3 uint16** 1<<BitsPerSample entry arrays
TIFFTAG_WHITEPOINT 1 float** 2-entry array
TIFFTAG_XPOSITION 1 float*
TIFFTAG_XRESOLUTION 1 float*
TIFFTAG_YCBCRCOEFFICIENTS 1 float** 3-entry array
TIFFTAG_YCBCRPOSITIONING 1 uint16*
TIFFTAG_YCBCRSUBSAMPLING 2 uint16*
TIFFTAG_YPOSITION 1 float*
TIFFTAG_YRESOLUTION 1 float*
TIFFTAG_ICCPROFILE 2 uint32*,void** count, profile data
</pre>If <i>SamplesPerPixel</i> is one, then a single array is returned; otherwise three arrays are returned.<br>
The contents of this field are quite complex. See <i>The ICC Profile Format Specification</i>, Annex B.3 "Embedding ICC Profiles in TIFF Files" (available at http://www.color.org) for an explanation.</td></table>
<a name="RETURN VALUES"></a>
<h2>RETURN VALUES</h2>
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1 is returned if the tag is defined in the current
directory; otherwise a 0 is returned.</td></table>
<a name="DIAGNOSTICS"></a>
<h2>DIAGNOSTICS</h2>
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All error messages are directed to the <i>TIFFError</i>(3T)
routine.</td></table>
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<b>Unknown field, tag 0x%x</b>. An unknown tag was
supplied.</td></table>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
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cols="2" cellspacing="0" cellpadding="0">
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<td width="10%"></td><td width="90%">
<i>libtiff</i>(3T), <i>TIFFOpen</i>(3T),
<i>TIFFSetField</i>(3T), <i>TIFFSetDirectory</i>(3T),
<i>TIFFReadDirectory</i>(3T),
<i>TIFFWriteDirectory</i>(3T)</td></table>
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