When using the method

                  createChild(int parentX, int parentY,
                              int width, int height,
                              int childMinX, int childMinY,
                              int bandList[])

on any Raster, the resulting child Raster will have a SampleModel which is
the same as that of the parent, if bandList is null. This will typically
result in the Raster width/height being different than that of it's
SampleModel, which is an error.