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+.\" $Id: TIFFSetField.3tiff,v 1.4.2.1 2010-05-06 02:54:43 olivier Exp $
+.\"
+.\" Copyright (c) 1988-1997 Sam Leffler
+.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
+.\"
+.\" Permission to use, copy, modify, distribute, and sell this software and 
+.\" its documentation for any purpose is hereby granted without fee, provided
+.\" that (i) the above copyright notices and this permission notice appear in
+.\" all copies of the software and related documentation, and (ii) the names of
+.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
+.\" publicity relating to the software without the specific, prior written
+.\" permission of Sam Leffler and Silicon Graphics.
+.\" 
+.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
+.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
+.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
+.\" 
+.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
+.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
+.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
+.\" OF THIS SOFTWARE.
+.\"
+.if n .po 0
+.TH TIFFSetField 3TIFF "October 29, 2004" "libtiff"
+.SH NAME
+TIFFSetField, TIFFVSetField \- set the value(s) of a tag in a
+.SM TIFF
+file open for writing
+.SH SYNOPSIS
+.B "#include <tiffio.h>"
+.sp
+.BI "int TIFFSetField(TIFF *" tif ", ttag_t " tag ", " ... ")"
+.sp
+.B "#include <stdarg.h>"
+.sp
+.BI "int TIFFVSetField(TIFF *" tif ", ttag_t " tag ", va_list " ap ")"
+.SH DESCRIPTION
+.IR TIFFSetField
+sets the value of a field
+or pseudo-tag in the current directory associated with
+the open
+.SM TIFF
+file
+.IR tif .
+(A
+.I pseudo-tag 
+is a parameter that is used to control the operation of the
+.SM TIFF
+library but whose value is not read or written to the underlying file.)
+To set the value of a field
+the file must have been previously opened for writing with
+.IR TIFFOpen (3TIFF);
+pseudo-tags can be set whether the file was opened for reading
+or writing.
+The field is identified by
+.IR tag ,
+one of the values defined in the include file
+.B tiff.h
+(see also the table below).
+The actual value is specified using a variable argument list,
+as prescribed by the
+.IR stdarg (3)
+interface (\c
+or, on some machines, the
+.IR varargs (3)
+interface.)
+.PP
+.IR TIFFVSetField
+is functionally equivalent to
+.IR TIFFSetField
+except that it takes a pointer to a variable
+argument list.
+.I TIFFVSetField
+is useful for writing routines that are layered
+on top of the functionality provided by
+.IR TIFFSetField .
+.PP
+The tags understood by
+.IR libtiff ,
+the number of parameter values, and the
+expected types for the parameter values are shown below.
+The data types are:
+.I char*
+is null-terminated string and corresponds to the
+.SM ASCII
+data type;
+.I uint16
+is an unsigned 16-bit value;
+.I uint32
+is an unsigned 32-bit value;
+.I uint16*
+is an array of unsigned 16-bit values.
+.I void*
+is an array of data values of unspecified type.
+
+Consult the
+.SM TIFF
+specification for information on the meaning of each tag.
+.PP
+.nf
+.ta \w'TIFFTAG_CONSECUTIVEBADFAXLINES'u+2n +\w'Count'u+2n +\w'TIFFFaxFillFunc \(dg'u+2n
+\fITag Name\fP	\fICount\fP	\fITypes\fP	\fINotes\fP
+.sp 5p
+TIFFTAG_ARTIST	1	char*
+TIFFTAG_BADFAXLINES	1	uint32
+TIFFTAG_BITSPERSAMPLE	1	uint16	\(dg
+TIFFTAG_CLEANFAXDATA	1	uint16
+TIFFTAG_COLORMAP	3	uint16*	1<<BitsPerSample arrays
+TIFFTAG_COMPRESSION	1	uint16	\(dg
+TIFFTAG_CONSECUTIVEBADFAXLINES	1	uint32
+TIFFTAG_COPYRIGHT	1	char*
+TIFFTAG_DATETIME	1	char*
+TIFFTAG_DOCUMENTNAME	1	char*
+TIFFTAG_DOTRANGE	2	uint16
+TIFFTAG_EXTRASAMPLES	2	uint16,uint16*	\(dg count & types array
+TIFFTAG_FAXFILLFUNC	1	TIFFFaxFillFunc	G3/G4 compression pseudo-tag
+TIFFTAG_FAXMODE	1	int	\(dg G3/G4 compression pseudo-tag
+TIFFTAG_FILLORDER	1	uint16	\(dg
+TIFFTAG_GROUP3OPTIONS	1	uint32	\(dg
+TIFFTAG_GROUP4OPTIONS	1	uint32	\(dg
+TIFFTAG_HALFTONEHINTS	2	uint16
+TIFFTAG_HOSTCOMPUTER	1	char*
+TIFFTAG_ICCPROFILE	2	uint32,void*	count, profile data
+TIFFTAG_IMAGEDEPTH	1	uint32	\(dg
+TIFFTAG_IMAGEDESCRIPTION	1	char*
+TIFFTAG_IMAGELENGTH	1	uint32
+TIFFTAG_IMAGEWIDTH	1	uint32	\(dg
+TIFFTAG_INKNAMES	2	uint16, char*
+TIFFTAG_INKSET	1	uint16	\(dg
+TIFFTAG_JPEGCOLORMODE	1	int	\(dg JPEG pseudo-tag
+TIFFTAG_JPEGQUALITY	1	int	JPEG pseudo-tag
+TIFFTAG_JPEGTABLES	2	uint32*,void*	\(dg count & tables
+TIFFTAG_JPEGTABLESMODE	1	int	\(dg JPEG pseudo-tag
+TIFFTAG_MAKE	1	char*
+TIFFTAG_MATTEING	1	uint16	\(dg
+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_PHOTOSHOP	?	uint32,void*	count, data
+TIFFTAG_PLANARCONFIG	1	uint16	\(dg
+TIFFTAG_PREDICTOR	1	uint16	\(dg
+TIFFTAG_PRIMARYCHROMATICITIES	1	float*	6-entry array
+TIFFTAG_REFERENCEBLACKWHITE	1	float*	\(dg 6-entry array
+TIFFTAG_RESOLUTIONUNIT	1	uint16
+TIFFTAG_RICHTIFFIPTC	2	uint32,void*	count, data
+TIFFTAG_ROWSPERSTRIP	1	uint32	\(dg must be > 0
+TIFFTAG_SAMPLEFORMAT	1	uint16	\(dg
+TIFFTAG_SAMPLESPERPIXEL	1	uint16	\(dg value must be <= 4
+TIFFTAG_SMAXSAMPLEVALUE	1	double
+TIFFTAG_SMINSAMPLEVALUE	1	double
+TIFFTAG_SOFTWARE	1	char*
+TIFFTAG_STONITS	1	double	\(dg
+TIFFTAG_SUBFILETYPE	1	uint32
+TIFFTAG_SUBIFD	2	uint16,uint32*	count & offsets array
+TIFFTAG_TARGETPRINTER	1	char*
+TIFFTAG_THRESHHOLDING	1	uint16
+TIFFTAG_TILEDEPTH	1	uint32	\(dg
+TIFFTAG_TILELENGTH	1	uint32	\(dg must be a multiple of 8
+TIFFTAG_TILEWIDTH	1	uint32	\(dg must be a multiple of 8
+TIFFTAG_TRANSFERFUNCTION	1 or 3\(dd uint16*	1<<BitsPerSample entry arrays
+TIFFTAG_WHITEPOINT	1	float*	2-entry array
+TIFFTAG_XMLPACKET	2	uint32,void*	count, data
+TIFFTAG_XPOSITION	1	float
+TIFFTAG_XRESOLUTION	1	float
+TIFFTAG_YCBCRCOEFFICIENTS	1	float*	\(dg 3-entry array
+TIFFTAG_YCBCRPOSITIONING	1	uint16	\(dg
+TIFFTAG_YCBCRSAMPLING	2	uint16	\(dg
+TIFFTAG_YPOSITION	1	float
+TIFFTAG_YRESOLUTION	1	float
+.fi
+.sp 5p
+\(dg Tag may not have its values changed once data is written.
+.br
+.fi
+\(dd
+If
+.I SamplesPerPixel
+is one, then a single array is passed; otherwise three arrays should be
+passed.
+.fi
+* The contents of this field are quite complex.  See 
+.BR "The ICC Profile Format Specification" ,
+Annex B.3 "Embedding ICC Profiles in TIFF Files"
+(available at http://www.color.org) for an explanation.
+.br
+.SH "RETURN VALUES"
+1 is returned if the operation was successful.
+Otherwise, 0 is returned if an error was detected.
+.SH DIAGNOSTICS
+All error messages are directed to the
+.BR TIFFError (3TIFF)
+routine.
+.PP
+\fB%s: Cannot modify tag "%s" while writing\fP.
+Data has already been written to the file, so the
+specified tag's value can not be changed.
+This restriction is applied to all tags that affect
+the format of written data.
+.PP
+\fB%d: Bad value for "%s"\fP.
+An invalid value was supplied for the named tag.
+.SH "SEE ALSO"
+.BR TIFFOpen (3TIFF),
+.BR TIFFGetField (3TIFF),
+.BR TIFFSetDirectory (3TIFF),
+.BR TIFFWriteDirectory (3TIFF),
+.BR TIFFReadDirectory (3TIFF),
+.BR libtiff (3TIFF)
+.PP
+Libtiff library home page:
+.BR http://www.remotesensing.org/libtiff/