ImageReader implementations are required to call this method exactly once when beginning an image 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.
ImageWriter implementations are required to call this method exactly once when beginning an image write operation.
@param source the ImageWriter object calling thismethod.
@param imageIndex the index of the image being written withinits containing input file or stream.
ImageReader implementations are required to call this method exactly once when beginning an image 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.
ImageWriter implementations are required to call this method exactly once when beginning an image write operation.
@param source the ImageWriter object calling thismethod.
@param imageIndex the index of the image being written withinits containing input file or stream.
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