SampleModel sm = getSampleModel().createCompatibleSampleModel(w, h); return new WritableRaster(sm, sm.createDataBuffer(), new Point(x, y));
return new WritableRaster(getSampleModel(), new Point(minX, minY));
  public WritableRaster createCompatibleWritableRaster(int x, int y,						       int w, int h)  {		SampleModel sm = getSampleModel().createCompatibleSampleModel(w, h);    return new WritableRaster(sm, sm.createDataBuffer(),			      new Point(x, y));	}