267 lines
8.3 KiB
HTML
267 lines
8.3 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML><HEAD><TITLE>Manpage of TIFFGetField</TITLE>
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</HEAD><BODY BGCOLOR=WHITE><FONT FACE="helvetica, sans, arial">
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<H1>TIFFGetField</H1>
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Section: Misc. Reference Manual Pages (3T)<BR>Updated: August 22, 1997<BR><A HREF="#index">Index</A>
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<BR><A HREF="index.html">Return to Main Contents</A>
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<HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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TIFFGetField, TIFFVGetField - get the value(s) of a tag in an open
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<FONT SIZE="-1">TIFF</FONT>
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file
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>#include <<A HREF="file:/usr/include/tiffio.h">tiffio.h</A>></B>
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<BR>
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<B>int TIFFGetField(TIFF* tif, ttag_t tag, ...)</B>
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<P>
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<B>#include <<A HREF="file:/usr/include/stdarg.h">stdarg.h</A>></B>
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<BR>
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<B>int TIFFVGetField(TIFF* tif, ttag_t tag, va_list ap)</B>
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<P>
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<B>int TIFFGetFieldDefaulted(TIFF* tif, ttag_t tag, ...)</B>
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<BR>
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<B>int TIFFVGetFieldDefaulted(TIFF* tif, ttag_t tag, va_list ap)</B>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<I>TIFFGetField</I>
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returns the value of a tag or pseudo-tag associated with the
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the current directory of the open
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<FONT SIZE="-1">TIFF</FONT>
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file
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<I>tif</I>.
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(A
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<I>pseudo-tag </I>
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is a parameter that is used to control the operation of the
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<FONT SIZE="-1">TIFF</FONT>
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library but whose value is not read or written to the underlying file.)
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The file must have been previously opened with
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<I><A HREF="TIFFOpen.3t.html">TIFFOpen</A></I>(3T).
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The tag is identified by
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<I>tag</I>,
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one of the values defined in the include file
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<B>tiff.h</B>
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(see also the table below).
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The type and number of values returned is dependent
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on the tag being requested.
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The programming interface uses a variable argument list
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as prescribed by the
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<I><A HREF="stdarg+3">stdarg</A></I>(3)
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interface.
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The returned values should only be interpreted if
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<I>TIFFGetField</I>
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returns 1.
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<P>
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<I>TIFFVGetField</I>
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is functionally equivalent to
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<I>TIFFGetField</I>
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except that it takes a pointer to a variable
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argument list.
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<I>TIFFVGetField</I>
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is useful for layering interfaces on top of
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the functionality provided by
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<I>TIFFGetField</I>.
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<P>
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<I>TIFFGetFieldDefaulted</I>
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and
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<I>TIFFVGetFieldDefaulted</I>
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are identical to
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<I>TIFFGetField</I>
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and
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<I>TIFFVGetField</I>,
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except that if a tag is not defined in the current directory
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and it has a default value, then the default value is returned.
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<P>
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The tags understood by
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<I>libtiff</I>,
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the number of parameter values, and the
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types for the returned values are shown below.
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The data types are specified as in C and correspond
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to the types used to specify tag values to
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<I><A HREF="TIFFSetField.3t.html">TIFFSetField</A></I>(3T).
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Remember that
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<I>TIFFGetField</I>
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returns parameter values, so all the listed
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data types are pointers to storage where values
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should be returned.
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Consult the
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<FONT SIZE="-1">TIFF</FONT>
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specification for information on the meaning of
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each tag and their possible values.
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<P>
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<PRE>
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<I>Tag Name</I> <I>Count</I> <I>Types</I> <I>Notes</I>
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TIFFTAG_ARTIST 1 char**
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TIFFTAG_BADFAXLINES 1 uint32*
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TIFFTAG_BITSPERSAMPLE 1 uint16*
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TIFFTAG_CLEANFAXDATA 1 uint16*
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TIFFTAG_COLORMAP 3 uint16** 1<<BitsPerSample arrays
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TIFFTAG_COMPRESSION 1 uint16*
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TIFFTAG_CONSECUTIVEBADFAXLINES 1 uint32*
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TIFFTAG_DATATYPE 1 uint16*
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TIFFTAG_DATETIME 1 char**
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TIFFTAG_DOCUMENTNAME 1 char**
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TIFFTAG_DOTRANGE 2 uint16*
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TIFFTAG_EXTRASAMPLES 2 uint16*,uint16** count & types array
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TIFFTAG_FAXMODE 1 int* G3/G4 compression pseudo-tag
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TIFFTAG_FAXFILLFUNC 1 TIFFFaxFillFunc* G3/G4 compression pseudo-tag
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TIFFTAG_FILLORDER 1 uint16*
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TIFFTAG_GROUP3OPTIONS 1 uint32*
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TIFFTAG_GROUP4OPTIONS 1 uint32*
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TIFFTAG_HALFTONEHINTS 2 uint16*
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TIFFTAG_HOSTCOMPUTER 1 char**
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TIFFTAG_IMAGEDEPTH 1 uint32*
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TIFFTAG_IMAGEDESCRIPTION 1 char**
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TIFFTAG_IMAGELENGTH 1 uint32*
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TIFFTAG_IMAGEWIDTH 1 uint32*
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TIFFTAG_INKNAMES 1 char**
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TIFFTAG_INKSET 1 uint16*
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TIFFTAG_JPEGTABLES 2 u_short*,void** count & tables
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TIFFTAG_JPEGQUALITY 1 int* JPEG pseudo-tag
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TIFFTAG_JPEGCOLORMODE 1 int* JPEG pseudo-tag
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TIFFTAG_JPEGTABLESMODE 1 int* JPEG pseudo-tag
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TIFFTAG_MAKE 1 char**
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TIFFTAG_MATTEING 1 uint16*
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TIFFTAG_MAXSAMPLEVALUE 1 uint16*
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TIFFTAG_MINSAMPLEVALUE 1 uint16*
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TIFFTAG_MODEL 1 char**
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TIFFTAG_ORIENTATION 1 uint16*
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TIFFTAG_PAGENAME 1 char**
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TIFFTAG_PAGENUMBER 2 uint16*
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TIFFTAG_PHOTOMETRIC 1 uint16*
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TIFFTAG_PLANARCONFIG 1 uint16*
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TIFFTAG_PREDICTOR 1 uint16*
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TIFFTAG_PRIMARYCHROMATICITIES 1 float** 6-entry array
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TIFFTAG_REFERENCEBLACKWHITE 1 float** 2*SamplesPerPixel array
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TIFFTAG_RESOLUTIONUNIT 1 uint16*
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TIFFTAG_ROWSPERSTRIP 1 uint32*
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TIFFTAG_SAMPLEFORMAT 1 uint16*
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TIFFTAG_SAMPLESPERPIXEL 1 uint16*
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TIFFTAG_SMAXSAMPLEVALUE 1 double*
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TIFFTAG_SMINSAMPLEVALUE 1 double*
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TIFFTAG_SOFTWARE 1 char**
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TIFFTAG_STONITS 1 double**
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TIFFTAG_STRIPBYTECOUNTS 1 uint32**
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TIFFTAG_STRIPOFFSETS 1 uint32**
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TIFFTAG_SUBFILETYPE 1 uint32*
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TIFFTAG_SUBIFD 2 uint16*,uint32** count & offsets array
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TIFFTAG_TARGETPRINTER 1 char**
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TIFFTAG_THRESHHOLDING 1 uint16*
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TIFFTAG_TILEBYTECOUNTS 1 uint32**
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TIFFTAG_TILEDEPTH 1 uint32*
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TIFFTAG_TILELENGTH 1 uint32*
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TIFFTAG_TILEOFFSETS 1 uint32**
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TIFFTAG_TILEWIDTH 1 uint32*
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TIFFTAG_TRANSFERFUNCTION 1 or 3+ uint16**1<<BitsPerSample entry arrays
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TIFFTAG_WHITEPOINT 1 float** 2-entry array
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TIFFTAG_XPOSITION 1 float*
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TIFFTAG_XRESOLUTION 1 float*
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TIFFTAG_YCBCRCOEFFICIENTS 1 float** 3-entry array
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TIFFTAG_YCBCRPOSITIONING 1 uint16*
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TIFFTAG_YCBCRSUBSAMPLING 2 uint16*
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TIFFTAG_YPOSITION 1 float*
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TIFFTAG_YRESOLUTION 1 float*
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TIFFTAG_ICCPROFILE 2 uint32*,void** count, profile datadd
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</PRE>
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+ If
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<I>SamplesPerPixel</I>
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is one, then a single array is returned; otherwise three arrays are
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returned.
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dd The contents of this field are quite complex. See
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<I>The ICC Profile Format Specification</I>,
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Annex B.3 "Embedding ICC Profiles in TIFF Files"
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(available at <A HREF="http://www.color.org)">http://www.color.org)</A> for an explanation.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUES</H2>
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1 is returned if the tag is defined in the current
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directory; otherwise a 0 is returned.
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<A NAME="lbAF"> </A>
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<H2>DIAGNOSTICS</H2>
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All error messages are directed to the
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<I><A HREF="TIFFError.3t.html">TIFFError</A></I>(3T)
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routine.
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<P>
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<B>Unknown field, tag 0x%x</B>.
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An unknown tag was supplied.
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<I><A HREF="libtiff.3t.html">libtiff</A></I>(3T),
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<I><A HREF="TIFFOpen.3t.html">TIFFOpen</A></I>(3T),
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<I><A HREF="TIFFSetField.3t.html">TIFFSetField</A></I>(3T),
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<I><A HREF="TIFFSetDirectory.3t.html">TIFFSetDirectory</A></I>(3T),
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<I><A HREF="TIFFReadDirectory.3t.html">TIFFReadDirectory</A></I>(3T),
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<I><A HREF="TIFFWriteDirectory.3t.html">TIFFWriteDirectory</A></I>(3T)
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT><A HREF="#lbAB">NAME</A><DD>
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<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT><A HREF="#lbAE">RETURN VALUES</A><DD>
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<DT><A HREF="#lbAF">DIAGNOSTICS</A><DD>
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<DT><A HREF="#lbAG">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="index.html">man2html</A>,
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using the manual pages.<BR>
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Time: 01:31:37 GMT, November 23, 1999
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</BODY>
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</HTML>
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