Also, this was tested with both bilinear and nearest neighbor interpolation
and with mosaic native acceleration enabled and disabled.

After more testing, I was able to track the slow performance down
specifically to the javax.media.jai.ROIShape.getAsImage() call that occurs
inside the com.sun.media.jai.opimage.MosaicOpImage constructor.  Using the
smaller ROI improves the performance of that specific method call while the
rest of the Mosaic operation is not noticeably impacted by which ROI is
used.


Steve Ikeoka



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