TIFFSetField(3TIFF) TIFFSetField(3TIFF)
NAME
TIFFSetField, TIFFVSetField - set the value(s) of a tag in a TIFF file
open for writing
SYNOPSIS
#include <tiffio.h>
int TIFFSetField(TIFF *tif, ttag_t tag, ...)
#include <stdarg.h>
int TIFFVSetField(TIFF *tif, ttag_t tag, va_list ap)
DESCRIPTION
TIFFSetField sets the value of a field or pseudo-tag in the current di-
rectory associated with the open TIFF file tif. (A pseudo-tag is a pa-
rameter that is used to control the operation of the 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 TIFFOpen(3TIFF); pseudo-tags can be set whether the file was
opened for reading or writing. The field is identified by tag, one of
the values defined in the include file tiff.h (see also the table be-
low). The actual value is specified using a variable argument list, as
prescribed by the stdarg(3) interface (or, on some machines, the
varargs(3) interface.)
TIFFVSetField is functionally equivalent to TIFFSetField except that it
takes a pointer to a variable argument list. TIFFVSetField is useful
for writing routines that are layered on top of the functionality pro-
vided by TIFFSetField.
The tags understood by libtiff, the number of parameter values, and the
expected types for the parameter values are shown below. The data
types are: char* is null-terminated string and corresponds to the ASCII
data type; uint16_t is an unsigned 16-bit value; uint32_t is an un-
signed 32-bit value; uint16_t* is an array of unsigned 16-bit values.
void* is an array of data values of unspecified type.
Consult the TIFF specification for information on the meaning of each
tag.
Tag Name Count Types Notes
TIFFTAG_ARTIST 1 char*
TIFFTAG_BADFAXLINES 1 uint32_t
TIFFTAG_BITSPERSAMPLE 1 uint16_t †
TIFFTAG_CLEANFAXDATA 1 uint16_t
TIFFTAG_COLORMAP 3 uint16_t* 1<<BitsPerSample arrays
TIFFTAG_COMPRESSION 1 uint16_t †
TIFFTAG_CONSECUTIVEBADFAXLINES 1 uint32_t
TIFFTAG_COPYRIGHT 1 char*
TIFFTAG_DATETIME 1 char*
TIFFTAG_DOCUMENTNAME 1 char*
TIFFTAG_DOTRANGE 2 uint16_t
TIFFTAG_EXTRASAMPLES 2 uint16_t,uint16_t* † count & types array
TIFFTAG_FAXFILLFUNC 1 TIFFFaxFillFunc G3/G4 compression pseudo-tag
TIFFTAG_FAXMODE 1 int † G3/G4 compression pseudo-tag
TIFFTAG_FILLORDER 1 uint16_t †
TIFFTAG_GROUP3OPTIONS 1 uint32_t †
TIFFTAG_GROUP4OPTIONS 1 uint32_t †
TIFFTAG_HALFTONEHINTS 2 uint16_t
TIFFTAG_HOSTCOMPUTER 1 char*
TIFFTAG_ICCPROFILE 2 uint32_t,void* count, profile data
TIFFTAG_IMAGEDEPTH 1 uint32_t †
TIFFTAG_IMAGEDESCRIPTION 1 char*
TIFFTAG_IMAGELENGTH 1 uint32_t
TIFFTAG_IMAGEWIDTH 1 uint32_t †
TIFFTAG_INKNAMES 2 uint16_t, char*
TIFFTAG_INKSET 1 uint16_t †
TIFFTAG_JPEGCOLORMODE 1 int † JPEG pseudo-tag
TIFFTAG_JPEGQUALITY 1 int JPEG pseudo-tag
TIFFTAG_JPEGTABLES 2 uint32_t*,void* † count & tables
TIFFTAG_JPEGTABLESMODE 1 int † JPEG pseudo-tag
TIFFTAG_MAKE 1 char*
TIFFTAG_MATTEING 1 uint16_t †
TIFFTAG_MAXSAMPLEVALUE 1 uint16_t
TIFFTAG_MINSAMPLEVALUE 1 uint16_t
TIFFTAG_MODEL 1 char*
TIFFTAG_ORIENTATION 1 uint16_t
TIFFTAG_PAGENAME 1 char*
TIFFTAG_PAGENUMBER 2 uint16_t
TIFFTAG_PHOTOMETRIC 1 uint16_t
TIFFTAG_PHOTOSHOP ? uint32_t,void* count, data
TIFFTAG_PLANARCONFIG 1 uint16_t †
TIFFTAG_PREDICTOR 1 uint16_t †
TIFFTAG_PRIMARYCHROMATICITIES 1 float* 6-entry array
TIFFTAG_REFERENCEBLACKWHITE 1 float* † 6-entry array
TIFFTAG_RESOLUTIONUNIT 1 uint16_t
TIFFTAG_RICHTIFFIPTC 2 uint32_t,void* count, data
TIFFTAG_ROWSPERSTRIP 1 uint32_t † must be > 0
TIFFTAG_SAMPLEFORMAT 1 uint16_t †
TIFFTAG_SAMPLESPERPIXEL 1 uint16_t † value must be <= 4
TIFFTAG_SMAXSAMPLEVALUE 1 double
TIFFTAG_SMINSAMPLEVALUE 1 double
TIFFTAG_SOFTWARE 1 char*
TIFFTAG_STONITS 1 double †
TIFFTAG_SUBFILETYPE 1 uint32_t
TIFFTAG_SUBIFD 2 uint16_t,uint64_t* count & offsets array
TIFFTAG_TARGETPRINTER 1 char*
TIFFTAG_THRESHHOLDING 1 uint16_t
TIFFTAG_TILEDEPTH 1 uint32_t †
TIFFTAG_TILELENGTH 1 uint32_t † must be a multiple of 8
TIFFTAG_TILEWIDTH 1 uint32_t † must be a multiple of 8
TIFFTAG_TRANSFERFUNCTION 1 or 3‡ uint16_t* 1<<BitsPerSample entry arrays
TIFFTAG_WHITEPOINT 1 float* 2-entry array
TIFFTAG_XMLPACKET 2 uint32_t,void* count, data
TIFFTAG_XPOSITION 1 float
TIFFTAG_XRESOLUTION 1 float
TIFFTAG_YCBCRCOEFFICIENTS 1 float* † 3-entry array
TIFFTAG_YCBCRPOSITIONING 1 uint16_t †
TIFFTAG_YCBCRSAMPLING 2 uint16_t †
TIFFTAG_YPOSITION 1 float
TIFFTAG_YRESOLUTION 1 float
† Tag may not have its values changed once data is written.
‡ If SamplesPerPixel is one, then a single array is passed; otherwise
three arrays should be passed.
* The contents of this field are quite complex. See The ICC Profile
Format Specification, Annex B.3 "Embedding ICC Profiles in TIFF Files"
(available at http://www.color.org) for an explanation.
RETURN VALUES
1 is returned if the operation was successful. Otherwise, 0 is re-
turned if an error was detected.
DIAGNOSTICS
All error messages are directed to the TIFFError(3TIFF) routine.
%s: Cannot modify tag "%s" while writing. Data has already been writ-
ten 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.
%d: Bad value for "%s". An invalid value was supplied for the named
tag.
SEE ALSO
TIFFOpen(3TIFF), TIFFGetField(3TIFF), TIFFSetDirectory(3TIFF),
TIFFWriteDirectory(3TIFF), TIFFReadDirectory(3TIFF), libtiff(3TIFF)
Libtiff library home page: http://www.simplesystems.org/libtiff/
libtiff October 29, 2004 TIFFSetField(3TIFF)
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