TIFFGetField(3TIFF)                           TIFFGetField(3TIFF)



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

SYNOPSIS
       #include 

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

       #include 

       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 open 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 TIFFGet-
       Field 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 iden-
       tical  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, 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  TIFFSet-
       Field(3TIFF).   Remember that TIFFGetField returns parame-
       ter values, so all the listed data types are  pointers  to
       storage where values should be returned.  Consult the TIFF
       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<





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