<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <HTML><HEAD><TITLE>Manpage of TIFFSetField</TITLE> </HEAD><BODY BGCOLOR=WHITE><FONT FACE="helvetica, sans, arial"> <H1>TIFFSetField</H1> Section: Misc. Reference Manual Pages (3T)<BR>Updated: August 28, 1997<BR><A HREF="#index">Index</A> <BR><A HREF="index.html">Return to Main Contents</A> <HR> <A NAME="lbAB"> </A> <H2>NAME</H2> TIFFSetField - set the value(s) of a tag in a <FONT SIZE="-1">TIFF</FONT> file open for writing <A NAME="lbAC"> </A> <H2>SYNOPSIS</H2> <B>#include <<A HREF="file:/usr/include/tiffio.h">tiffio.h</A>></B> <BR> <B>int TIFFSetField(TIFF* tif, ttag_t tag, ...)</B> <BR> <B>#include <<A HREF="file:/usr/include/stdarg.h">stdarg.h</A>></B> <BR> <B>int TIFFVSetField(TIFF* tif, ttag_t tag, va_list ap)</B> <A NAME="lbAD"> </A> <H2>DESCRIPTION</H2> <I>TIFFSetField</I> sets the value of a field or pseudo-tag in the current directory associated with the open <FONT SIZE="-1">TIFF</FONT> file <I>tif</I>. (A <I>pseudo-tag </I> is a parameter that is used to control the operation of the <FONT SIZE="-1">TIFF</FONT> 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 <I><A HREF="TIFFOpen.3t.html">TIFFOpen</A></I>(3T); pseudo-tags can be set whether the file was opened for reading or writing. The field 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 actual value is specified using a variable argument list, as prescribed by the <I><A HREF="stdarg+3">stdarg</A></I>(3) interface (or, on some machines, the <I><A HREF="varargs+3">varargs</A></I>(3) interface.) <P> <I>TIFFVSetField</I> is functionally equivalent to <I>TIFFSetField</I> except that it takes a pointer to a variable argument list. <I>TIFFVSetField</I> is useful for writing routines that are layered on top of the functionality provided by <I>TIFFSetField</I>. <P> The tags understood by <I>libtiff</I>, the number of parameter values, and the expected types for the parameter values are shown below. The data types are: <I>char*</I> is null-terminated string and corresponds to the <FONT SIZE="-1">ASCII</FONT> data type; <I>uint16</I> is an unsigned 16-bit value; <I>uint32</I> is an unsigned 32-bit value; <I>uint16*</I> is an array of unsigned 16-bit values. <I>void*</I> is an array of data values of unspecified type. <P> Consult the <FONT SIZE="-1">TIFF</FONT> specification for information on the meaning of each tag. <P> <PRE> <I>Tag Name</I> <I>Count</I> <I>Types</I> <I>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_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_IMAGEDESCRIPTION 1 char* TIFFTAG_IMAGEDEPTH 1 uint32 + TIFFTAG_IMAGELENGTH 1 uint32 TIFFTAG_IMAGEWIDTH 1 uint32 + TIFFTAG_INKNAMES 1 char* TIFFTAG_INKSET 1 uint16 + TIFFTAG_JPEGTABLES 2 uint32*,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 + must be > 0 TIFFTAG_SAMPLEFORMAT 1 uint16 + TIFFTAG_SAMPLESPERPIXEL 1 uint16 + value must be <= 4 TIFFTAG_SMAXSAMPLEVALUE 1 double TIFFTAG_SMINSAMPLEVALUE 1 double TIFFTAG_SOFTWARE 1 char* TIFFTAG_STONITS 1 double + TIFFTAG_SUBFILETYPE 1 uint32 TIFFTAG_SUBIFD 2 uint16,uint32* count & offsets array TIFFTAG_TARGETPRINTER 1 char* TIFFTAG_THRESHHOLDING 1 uint16 TIFFTAG_TILEDEPTH 1 uint32 + TIFFTAG_TILELENGTH 1 uint32 + must be a multiple of 8 TIFFTAG_TILEWIDTH 1 uint32 + must be a multiple of 8 TIFFTAG_TRANSFERFUNCTION 1 or 3 dd uint16*1<<BitsPerSample entry arrays TIFFTAG_XPOSITION 1 float TIFFTAG_XRESOLUTION 1 float TIFFTAG_WHITEPOINT 1 float* 2-entry array TIFFTAG_YCBCRCOEFFICIENTS 1 float* + 3-entry array TIFFTAG_YCBCRPOSITIONING 1 uint16 + TIFFTAG_YCBCRSAMPLING 2 uint16 + TIFFTAG_YPOSITION 1 float TIFFTAG_YRESOLUTION 1 float TIFFTAG_ICCPROFILE 2 uint32,void* count, profile data* </PRE> <P> + Tag may not have its values changed once data is written. <BR> dd If <I>SamplesPerPixel</I> is one, then a single array is passed; otherwise three arrays should be passed. * 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 <A HREF="http://www.color.org)">http://www.color.org)</A> for an explanation. <BR> <A NAME="lbAE"> </A> <H2>RETURN VALUES</H2> 1 is returned if the tag is defined in the current directory; otherwise a 0 is returned. <A NAME="lbAF"> </A> <H2>RETURN VALUES</H2> 1 is returned if the operation was successful. Otherwise, 0 is returned if an error was detected. <A NAME="lbAG"> </A> <H2>DIAGNOSTICS</H2> All error messages are directed to the <I><A HREF="TIFFError.3t.html">TIFFError</A></I>(3T) routine. <P> <B>%s: Cannot modify tag "%s" while writing</B>. 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. <P> <B>%d: Bad value for "%s"</B>. An invalid value was supplied for the named tag. <A NAME="lbAH"> </A> <H2>SEE ALSO</H2> <I><A HREF="libtiff.3t.html">libtiff</A></I>(3T), <I><A HREF="TIFFOpen.3t.html">TIFFOpen</A></I>(3T), <I><A HREF="TIFFGetField.3t.html">TIFFGetField</A></I>(3T), <I><A HREF="TIFFSetDirectory.3t.html">TIFFSetDirectory</A></I>(3T), <I><A HREF="TIFFWriteDirectory.3t.html">TIFFWriteDirectory</A></I>(3T), <I><A HREF="TIFFReadDirectory.3t.html">TIFFReadDirectory</A></I>(3T) <HR> <A NAME="index"> </A><H2>Index</H2> <DL> <DT><A HREF="#lbAB">NAME</A><DD> <DT><A HREF="#lbAC">SYNOPSIS</A><DD> <DT><A HREF="#lbAD">DESCRIPTION</A><DD> <DT><A HREF="#lbAE">RETURN VALUES</A><DD> <DT><A HREF="#lbAF">RETURN VALUES</A><DD> <DT><A HREF="#lbAG">DIAGNOSTICS</A><DD> <DT><A HREF="#lbAH">SEE ALSO</A><DD> </DL> <HR> This document was created by <A HREF="index.html">man2html</A>, using the manual pages.<BR> Time: 01:31:38 GMT, November 23, 1999 </BODY> </HTML>
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