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CentOS 7.0 - man page for tiffreaddirectory (centos section 3TIFF)

TIFFReadDirectory(3TIFF)						 TIFFReadDirectory(3TIFF)

NAME
       TIFFReadDirectory - get the contents of the next directory in an open TIFF file

SYNOPSIS
       #include <tiffio.h>

       int TIFFReadDirectory(TIFF *tif)

DESCRIPTION
       Read  the next directory in the specified file and make it the current directory. Applica-
       tions only need to call TIFFReadDirectory to read  multiple  subfiles  in  a  single  TIFF
       file-- the first directory in a file is automatically read when TIFFOpen is called.

NOTES
       If  the library is compiled with STRIPCHOP_SUPPORT enabled, then images that have a single
       uncompressed strip or tile of data are automatically treated as if they were  made  up  of
       multiple  strips  or  tiles of approximately 8 kilobytes each. This operation is done only
       in-memory; it does not alter the contents of the file. However, the  construction  of  the
       ``chopped  strips''  is	visible  to  the application through the number of strips [tiles]
       returned by TIFFNumberOfStrips [TIFFNumberOfTiles].

RETURN VALUES
       If the next directory was successfully read, 1 is returned. Otherwise, 0 is returned if an
       error was encountered, or if there are no more directories to be read.

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

       Seek error accessing TIFF directory.  An error occurred while positioning to the  location
       of the directory.

       Wrong  data  type %d for field "%s".  The tag entry in the directory had an incorrect data
       type.  For example, an ImageDescription tag with a SHORT data type.

       TIFF directory is missing required "%s" field.	The  specified	tag  is  required  to  be
       present	by  the TIFF 5.0 specification, but is missing.  The directory is (usually) unus-
       able.

       %s: Rational with zero denominator.  A directory tag has a RATIONAL value whose	denomina-
       tor is zero.

       Incorrect  count %d for field "%s" (%lu, expecting %lu); tag ignored.  The specified tag's
       count field is bad.  For example, a count other than 1 for a SubFileType tag.

       Cannot handle different per-sample values for field "%s".   The	tag  has  SamplesPerPixel
       values  and they are not all the same; e.g.  BitsPerSample.  The library is unable to han-
       dle images of this sort.

       Count mismatch for field "%s"; expecting %d, got %d.  The count field in a  tag	does  not
       agree  with  the number expected by the library.  This should never happen, so if it does,
       the library refuses to read the directory.

       Invalid TIFF directory; tags are not sorted in ascending order.	The  directory	tags  are
       not properly sorted as specified in the TIFF 5.0 specification.	This error is not fatal.

       Ignoring  unknown  field with tag %d (0x%x).  An unknown tag was encountered in the direc-
       tory; the library ignores all such tags.

       TIFF directory is missing required "ImageLength" field.	The image violates the specifica-
       tion  by  not  having  a necessary field.  There is no way for the library to recover from
       this error.

       TIFF directory is missing required "PlanarConfig" field.  The image violates the  specifi-
       cation  by  not having a necessary field.  There is no way for the library to recover from
       this error.

       TIFF directory is missing required "StripOffsets" field.  The image has	multiple  strips,
       but  is missing the tag that specifies the file offset to each strip of data.  There is no
       way for the library to recover from this error.

       TIFF directory is missing required "TileOffsets" field.	The image has multiple tiles, but
       is  missing  the tag that specifies the file offset to each tile of data.  There is no way
       for the library to recover from this error.

       TIFF directory is missing  required  "StripByteCounts"  field.	The  image  has  multiple
       strips, but is missing the tag that specifies the size of each strip of data.  There is no
       way for the library to recover from this error.

       TIFF directory is missing required "StripByteCounts" field, calculating from  imagelength.
       The  image  violates the specification by not having a necessary field.	However, when the
       image is comprised of only one strip or tile, the library will estimate the missing  value
       based on the file size.

       Bogus "StripByteCounts" field, ignoring and calculating from imagelength.  Certain vendors
       violate the specification by writing zero for the StripByteCounts tag when  they  want  to
       leave  the  value unspecified.  If the image has a single strip, the library will estimate
       the missing value based on the file size.

SEE ALSO
       TIFFOpen(3TIFF),  TIFFWriteDirectory(3TIFF),   TIFFSetDirectory(3TIFF),	 TIFFSetSubDirec-
       tory(3TIFF), libtiff(3TIFF)

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

libtiff 				 October 15, 1995		 TIFFReadDirectory(3TIFF)


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