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TIFFGetField.3tiff

NAME

TIFFGetField, TIFFVGetField - get the value(s) of a tag in an open TIFF file

SYNOPSIS

#include <tiffio.h>

int TIFFGetField(TIFF *tif, ttag_t tag, ...)

#include <stdarg.h>

int TIFFVGetField(TIFF *tif, ttag_t tag, va_list ap)
int TIFFGetFieldDefaulted(TIFF *tif, ttag_t tag, ...)
int TIFFVGetFieldDefaulted(TIFF *tif, ttag_t tag, va_list ap)

DESCRIPTION

TIFFGetField returns the value of a tag or pseudo-tag associated with the the current directory of the opened TIFF file tif. (A pseudo-tag is a parameter that is used to control the operation of the TIFF library but whose value is not read or written to the underlying file.) The file must have been previously opened with TIFFOpen(3TIFF). The tag is identified by tag, one of the values defined in the include file tiff.h (see also the table below). The type and number of values returned is dependent on the tag being requested. The programming interface uses a variable argument list as prescribed by the stdarg(3) interface. The returned values should only be interpreted if TIFFGetField returns 1.

TIFFVGetField is functionally equivalent to TIFFGetField except that it takes a pointer to a variable argument list. TIFFVGetField is useful for layering interfaces on top of the functionality provided by TIFFGetField.

TIFFGetFieldDefaulted and TIFFVGetFieldDefaulted are identical to TIFFGetField and TIFFVGetField, except that if a tag is not defined in the current directory and it has a default value, then the default value is returned.

The tags understood by libtiff(3TIFF), the number of parameter values, and the types for the returned values are shown below. The data types are specified as in C and correspond to the types used to specify tag values to TIFFSetField(3TIFF). Remember that TIFFGetField returns parameter values, so all the listed data types are pointers to storage where values should be returned. Consult the TIFF specification (or relevant industry specification) for information on the meaning of each tag and their possible values.

 
 Tag Name                        Count  Types             Notes
 
 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_COPYRIGHT               1      char**
 TIFFTAG_DATATYPE                1      uint16*
 TIFFTAG_DATETIME                1      char**
 TIFFTAG_DOCUMENTNAME            1      char**
 TIFFTAG_DOTRANGE                2      uint16*
 TIFFTAG_EXTRASAMPLES            2      uint16*,uint16**  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*
 TIFFTAG_GROUP3OPTIONS           1      uint32*
 TIFFTAG_GROUP4OPTIONS           1      uint32*
 TIFFTAG_HALFTONEHINTS           2      uint16*
 TIFFTAG_HOSTCOMPUTER            1      char**
 TIFFTAG_ICCPROFILE              2      uint32*,void**    count, profile data
 TIFFTAG_IMAGEDEPTH              1      uint32*
 TIFFTAG_IMAGEDESCRIPTION        1      char**
 TIFFTAG_IMAGELENGTH             1      uint32*
 TIFFTAG_IMAGEWIDTH              1      uint32*
 TIFFTAG_INKNAMES                1      char**
 TIFFTAG_INKSET                  1      uint16*
 TIFFTAG_JPEGCOLORMODE           1      int*              JPEG pseudo-tag
 TIFFTAG_JPEGQUALITY             1      int*              JPEG pseudo-tag
 TIFFTAG_JPEGTABLES              2      uint32*,void**    count & tables
 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_PHOTOSHOP               2      uint32*,void**    count, data
 TIFFTAG_PLANARCONFIG            1      uint16*
 TIFFTAG_PREDICTOR               1      uint16*
 TIFFTAG_PRIMARYCHROMATICITIES   1      float**           6-entry array
 TIFFTAG_REFERENCEBLACKWHITE     1      float**           6-entry array
 TIFFTAG_RESOLUTIONUNIT          1      uint16*
 TIFFTAG_RICHTIFFIPTC            2      uint32*,void**    count, data
 TIFFTAG_ROWSPERSTRIP            1      uint32*
 TIFFTAG_SAMPLEFORMAT            1      uint16*
 TIFFTAG_SAMPLESPERPIXEL         1      uint16*
 TIFFTAG_SMAXSAMPLEVALUE         1      double*
 TIFFTAG_SMINSAMPLEVALUE         1      double*
 TIFFTAG_SOFTWARE                1      char**
 TIFFTAG_STONITS                 1      double**
 TIFFTAG_STRIPBYTECOUNTS         1      uint32**
 TIFFTAG_STRIPOFFSETS            1      uint32**
 TIFFTAG_SUBFILETYPE             1      uint32*
 TIFFTAG_SUBIFD                  2      uint16*,uint32**  count & offsets array
 TIFFTAG_TARGETPRINTER           1      char**
 TIFFTAG_THRESHHOLDING           1      uint16*
 TIFFTAG_TILEBYTECOUNTS          1      uint32**
 TIFFTAG_TILEDEPTH               1      uint32*
 TIFFTAG_TILELENGTH              1      uint32*
 TIFFTAG_TILEOFFSETS             1      uint32**
 TIFFTAG_TILEWIDTH               1      uint32*
 TIFFTAG_TRANSFERFUNCTION        1 or 3+                  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**           3-entry array
 TIFFTAG_YCBCRPOSITIONING        1      uint16*
 TIFFTAG_YCBCRSUBSAMPLING        2      uint16*
 TIFFTAG_YPOSITION               1      float*
 TIFFTAG_YRESOLUTION             1      float*dd
 

+ If SamplesPerPixel is one, then a single array is returned; otherwise three arrays are returned. dd 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.

AUTOREGISTERED TAGS

If you can't find the tag in the table above that means this is unsupported tag. But you still be able to read it's value if you know the data type of that tag. For example, if you want to read the LONG value from the tag 33424 and ASCII string from the tag 36867 you can use the following code:

 uint16  count;
 void    *data;
 
 TIFFGetField(tiff, 33424, &count, &data);
 printf("Tag %d: %d, count %d, 33424, *(uint32 *)data, count);
 TIFFGetField(tiff, 36867, &count, &data);
 printf("Tag %d: %s, count %d, 36867, (char *)data, count);
 

is not supported by libtiff(3TIFF), library

RETURN VALUES

1 is returned if the tag is defined in the current directory; otherwise a 0 is returned.

DIAGNOSTICS

All error messages are directed to the TIFFError(3TIFF) routine.

Unknown field, tag 0x%x. An unknown tag was supplied.

SEE ALSO

TIFFOpen(3TIFF), TIFFSetField(3TIFF), TIFFSetDirectory(3TIFF), TIFFReadDirectory(3TIFF), TIFFWriteDirectory(3TIFF) libtiff(3TIFF),

Libtiff library home page: http://www.remotesensing.org/libtiff/