src/tiff/man/TIFFSetField.3tiff

.\" $Id: TIFFSetField.3tiff,v 1.4 2006/01/02 23:50:44 bfriesen 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 2*SamplesPerPixel 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/
Commit	Line	Data
	1	.\" $Id: TIFFSetField.3tiff,v 1.4 2006/01/02 23:50:44 bfriesen Exp $
	2	.\"
	3	.\" Copyright (c) 1988-1997 Sam Leffler
	4	.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
	5	.\"
	6	.\" Permission to use, copy, modify, distribute, and sell this software and
	7	.\" its documentation for any purpose is hereby granted without fee, provided
	8	.\" that (i) the above copyright notices and this permission notice appear in
	9	.\" all copies of the software and related documentation, and (ii) the names of
	10	.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
	11	.\" publicity relating to the software without the specific, prior written
	12	.\" permission of Sam Leffler and Silicon Graphics.
	13	.\"
	14	.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	15	.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	16	.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	17	.\"
	18	.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	19	.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	20	.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	21	.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	22	.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	23	.\" OF THIS SOFTWARE.
	24	.\"
	25	.if n .po 0
	26	.TH TIFFSetField 3TIFF "October 29, 2004" "libtiff"
	27	.SH NAME
	28	TIFFSetField, TIFFVSetField \- set the value(s) of a tag in a
	29	.SM TIFF
	30	file open for writing
	31	.SH SYNOPSIS
	32	.B "#include <tiffio.h>"
	33	.sp
	34	.BI "int TIFFSetField(TIFF *" tif ", ttag_t " tag ", " ... ")"
	35	.sp
	36	.B "#include <stdarg.h>"
	37	.sp
	38	.BI "int TIFFVSetField(TIFF *" tif ", ttag_t " tag ", va_list " ap ")"
	39	.SH DESCRIPTION
	40	.IR TIFFSetField
	41	sets the value of a field
	42	or pseudo-tag in the current directory associated with
	43	the open
	44	.SM TIFF
	45	file
	46	.IR tif .
	47	(A
	48	.I pseudo-tag
	49	is a parameter that is used to control the operation of the
	50	.SM TIFF
	51	library but whose value is not read or written to the underlying file.)
	52	To set the value of a field
	53	the file must have been previously opened for writing with
	54	.IR TIFFOpen (3TIFF);
	55	pseudo-tags can be set whether the file was opened for reading
	56	or writing.
	57	The field is identified by
	58	.IR tag ,
	59	one of the values defined in the include file
	60	.B tiff.h
	61	(see also the table below).
	62	The actual value is specified using a variable argument list,
	63	as prescribed by the
	64	.IR stdarg (3)
	65	interface (\c
	66	or, on some machines, the
	67	.IR varargs (3)
	68	interface.)
	69	.PP
	70	.IR TIFFVSetField
	71	is functionally equivalent to
	72	.IR TIFFSetField
	73	except that it takes a pointer to a variable
	74	argument list.
	75	.I TIFFVSetField
	76	is useful for writing routines that are layered
	77	on top of the functionality provided by
	78	.IR TIFFSetField .
	79	.PP
	80	The tags understood by
	81	.IR libtiff ,
	82	the number of parameter values, and the
	83	expected types for the parameter values are shown below.
	84	The data types are:
	85	.I char*
	86	is null-terminated string and corresponds to the
	87	.SM ASCII
	88	data type;
	89	.I uint16
	90	is an unsigned 16-bit value;
	91	.I uint32
	92	is an unsigned 32-bit value;
	93	.I uint16*
	94	is an array of unsigned 16-bit values.
	95	.I void*
	96	is an array of data values of unspecified type.
	97
	98	Consult the
	99	.SM TIFF
	100	specification for information on the meaning of each tag.
	101	.PP
	102	.nf
	103	.ta \w'TIFFTAG_CONSECUTIVEBADFAXLINES'u+2n +\w'Count'u+2n +\w'TIFFFaxFillFunc \(dg'u+2n
	104	\fITag Name\fP \fICount\fP \fITypes\fP \fINotes\fP
	105	.sp 5p
	106	TIFFTAG_ARTIST 1 char*
	107	TIFFTAG_BADFAXLINES 1 uint32
	108	TIFFTAG_BITSPERSAMPLE 1 uint16 \(dg
	109	TIFFTAG_CLEANFAXDATA 1 uint16
	110	TIFFTAG_COLORMAP 3 uint16* 1<<BitsPerSample arrays
	111	TIFFTAG_COMPRESSION 1 uint16 \(dg
	112	TIFFTAG_CONSECUTIVEBADFAXLINES 1 uint32
	113	TIFFTAG_COPYRIGHT 1 char*
	114	TIFFTAG_DATETIME 1 char*
	115	TIFFTAG_DOCUMENTNAME 1 char*
	116	TIFFTAG_DOTRANGE 2 uint16
	117	TIFFTAG_EXTRASAMPLES 2 uint16,uint16* \(dg count & types array
	118	TIFFTAG_FAXFILLFUNC 1 TIFFFaxFillFunc G3/G4 compression pseudo-tag
	119	TIFFTAG_FAXMODE 1 int \(dg G3/G4 compression pseudo-tag
	120	TIFFTAG_FILLORDER 1 uint16 \(dg
	121	TIFFTAG_GROUP3OPTIONS 1 uint32 \(dg
	122	TIFFTAG_GROUP4OPTIONS 1 uint32 \(dg
	123	TIFFTAG_HALFTONEHINTS 2 uint16
	124	TIFFTAG_HOSTCOMPUTER 1 char*
	125	TIFFTAG_ICCPROFILE 2 uint32,void* count, profile data
	126	TIFFTAG_IMAGEDEPTH 1 uint32 \(dg
	127	TIFFTAG_IMAGEDESCRIPTION 1 char*
	128	TIFFTAG_IMAGELENGTH 1 uint32
	129	TIFFTAG_IMAGEWIDTH 1 uint32 \(dg
	130	TIFFTAG_INKNAMES 2 uint16, char*
	131	TIFFTAG_INKSET 1 uint16 \(dg
	132	TIFFTAG_JPEGCOLORMODE 1 int \(dg JPEG pseudo-tag
	133	TIFFTAG_JPEGQUALITY 1 int JPEG pseudo-tag
	134	TIFFTAG_JPEGTABLES 2 uint32,void \(dg count & tables
	135	TIFFTAG_JPEGTABLESMODE 1 int \(dg JPEG pseudo-tag
	136	TIFFTAG_MAKE 1 char*
	137	TIFFTAG_MATTEING 1 uint16 \(dg
	138	TIFFTAG_MAXSAMPLEVALUE 1 uint16
	139	TIFFTAG_MINSAMPLEVALUE 1 uint16
	140	TIFFTAG_MODEL 1 char*
	141	TIFFTAG_ORIENTATION 1 uint16
	142	TIFFTAG_PAGENAME 1 char*
	143	TIFFTAG_PAGENUMBER 2 uint16
	144	TIFFTAG_PHOTOMETRIC 1 uint16
	145	TIFFTAG_PHOTOSHOP ? uint32,void* count, data
	146	TIFFTAG_PLANARCONFIG 1 uint16 \(dg
	147	TIFFTAG_PREDICTOR 1 uint16 \(dg
	148	TIFFTAG_PRIMARYCHROMATICITIES 1 float* 6-entry array
	149	TIFFTAG_REFERENCEBLACKWHITE 1 float* \(dg 2*SamplesPerPixel array
	150	TIFFTAG_RESOLUTIONUNIT 1 uint16
	151	TIFFTAG_RICHTIFFIPTC 2 uint32,void* count, data
	152	TIFFTAG_ROWSPERSTRIP 1 uint32 \(dg must be > 0
	153	TIFFTAG_SAMPLEFORMAT 1 uint16 \(dg
	154	TIFFTAG_SAMPLESPERPIXEL 1 uint16 \(dg value must be <= 4
	155	TIFFTAG_SMAXSAMPLEVALUE 1 double
	156	TIFFTAG_SMINSAMPLEVALUE 1 double
	157	TIFFTAG_SOFTWARE 1 char*
	158	TIFFTAG_STONITS 1 double \(dg
	159	TIFFTAG_SUBFILETYPE 1 uint32
	160	TIFFTAG_SUBIFD 2 uint16,uint32* count & offsets array
	161	TIFFTAG_TARGETPRINTER 1 char*
	162	TIFFTAG_THRESHHOLDING 1 uint16
	163	TIFFTAG_TILEDEPTH 1 uint32 \(dg
	164	TIFFTAG_TILELENGTH 1 uint32 \(dg must be a multiple of 8
	165	TIFFTAG_TILEWIDTH 1 uint32 \(dg must be a multiple of 8
	166	TIFFTAG_TRANSFERFUNCTION 1 or 3\(dd uint16* 1<<BitsPerSample entry arrays
	167	TIFFTAG_WHITEPOINT 1 float* 2-entry array
	168	TIFFTAG_XMLPACKET 2 uint32,void* count, data
	169	TIFFTAG_XPOSITION 1 float
	170	TIFFTAG_XRESOLUTION 1 float
	171	TIFFTAG_YCBCRCOEFFICIENTS 1 float* \(dg 3-entry array
	172	TIFFTAG_YCBCRPOSITIONING 1 uint16 \(dg
	173	TIFFTAG_YCBCRSAMPLING 2 uint16 \(dg
	174	TIFFTAG_YPOSITION 1 float
	175	TIFFTAG_YRESOLUTION 1 float
	176	.fi
	177	.sp 5p
	178	\(dg Tag may not have its values changed once data is written.
	179	.br
	180	.fi
	181	\(dd
	182	If
	183	.I SamplesPerPixel
	184	is one, then a single array is passed; otherwise three arrays should be
	185	passed.
	186	.fi
	187	* The contents of this field are quite complex. See
	188	.BR "The ICC Profile Format Specification" ,
	189	Annex B.3 "Embedding ICC Profiles in TIFF Files"
	190	(available at http://www.color.org) for an explanation.
	191	.br
	192	.SH "RETURN VALUES"
	193	1 is returned if the operation was successful.
	194	Otherwise, 0 is returned if an error was detected.
	195	.SH DIAGNOSTICS
	196	All error messages are directed to the
	197	.BR TIFFError (3TIFF)
	198	routine.
	199	.PP
	200	\fB%s: Cannot modify tag "%s" while writing\fP.
	201	Data has already been written to the file, so the
	202	specified tag's value can not be changed.
	203	This restriction is applied to all tags that affect
	204	the format of written data.
	205	.PP
	206	\fB%d: Bad value for "%s"\fP.
	207	An invalid value was supplied for the named tag.
	208	.SH "SEE ALSO"
	209	.BR TIFFOpen (3TIFF),
	210	.BR TIFFGetField (3TIFF),
	211	.BR TIFFSetDirectory (3TIFF),
	212	.BR TIFFWriteDirectory (3TIFF),
	213	.BR TIFFReadDirectory (3TIFF),
	214	.BR libtiff (3TIFF)
	215	.PP
	216	Libtiff library home page:
	217	.BR http://www.remotesensing.org/libtiff/