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+TIFFFieldTag
+============
+
+Synopsis
+--------
+
+.. highlight:: c
+
+::
+
+    #include <tiffio.h>
+
+.. c:function:: uint32_t TIFFFieldTag(const TIFFField* fip)
+
+Description
+-----------
+
+:c:func:`TIFFFieldTag` returns the numeric tag value for a TIFF field.
+This can be compared to various constants exported by the :program:`libtiff`
+header files, such as :c:macro:`TIFFTAG_IMAGEWIDTH`.
+
+*fip* is a field information pointer previously returned by
+:c:func:`TIFFFindField`, :c:func:`TIFFFieldWithTag`, or :c:func:`TIFFFieldWithName`.
+
+Return values
+-------------
+
+:c:func:`TIFFFieldTag` returns an integer tag value.
+
+See also
+--------
+
+:doc:`libtiff` (3tiff)