.\" .\" 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 " .sp .BI "int TIFFSetField(TIFF *" tif ", ttag_t " tag ", " ... ")" .sp .B "#include " .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< 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,uint64* 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<