ImageReader implementations are required to call this method exactly once when beginning a thumbnail read operation.
@param source the ImageReader object calling this method.
@param imageIndex the index of the image being read within itscontaining input file or stream.
@param thumbnailIndex the index of the thumbnail being read.
ImageWriter implementations are required to call this method exactly once when beginning a thumbnail write operation.
@param source the ImageWrite object calling this method.
@param imageIndex the index of the image being written within itscontaining input file or stream.
@param thumbnailIndex the index of the thumbnail being written.
ImageReader implementations are required to call this method exactly once when beginning a thumbnail read operation.
@param source the ImageReader object calling this method.
@param imageIndex the index of the image being read within itscontaining input file or stream.
@param thumbnailIndex the index of the thumbnail being read.
ImageWriter implementations are required to call this method exactly once when beginning a thumbnail write operation.
@param source the ImageWrite object calling this method.
@param imageIndex the index of the image being written within itscontaining input file or stream.
@param thumbnailIndex the index of the thumbnail being written.
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