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Read the contents of the specified tile into the (user
supplied) data buffer. Note that the value of tile is
a ‘‘raw tile number.’’ That is, the
caller must take into account whether or not the data is
organized in separate planes (PlanarConfiguration=2).
TIFFComputeTile automatically does this when
converting an (x,y,z,sample) coordinate quadruple to a tile
number. To read a full tile of data the data buffer should
typically be at least as large as the value returned by
TIFFTileSize.
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