DOC: Add note about roi chunk re-alignment

Author: thewtex

examples/integrations/itk/SelectROI.ipynb

@@ -599,6 +599,13 @@
     "to_ngff_zarr('roi.zarr', multiscales=roi_multiscales)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "If the goal is just to view or process the ROI, use `get_roi_image`. If the goal is to save the entire roi to disk, use `get_roi_multiscales` followed `to_ngff_zarr`. There is a need to re-align array chunks after roi extraction, which can take some time for the entire multiscale dataset with very large images."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 17,

examples/integrations/itkwasm/SelectROI.ipynb

@@ -588,6 +588,13 @@
     "to_ngff_zarr('roi.zarr', multiscales=roi_multiscales)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "If the goal is just to view or process the ROI, use `get_roi_image`. If the goal is to save the entire roi to disk, use `get_roi_multiscales` followed `to_ngff_zarr`. There is a need to re-align array chunks after roi extraction, which can take some time for the entire multiscale dataset with very large images."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 17,