TIFFSetDirectory changes the current directory and
reads its contents with TIFFReadDirectory. The
parameter dirnum specifies the subfile/directory as
an integer number, with the first directory numbered
zero.
TIFFSetSubDirectory acts like
TIFFSetDirectory, except the directory is specified
as a file offset instead of an index; this is required for
accessing subdirectories linked through a SubIFD
tag.
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