registration got unmatched images

[pfren1998]

Hi, here I tried to register the DAPI staining images between nanostring and xenium, and apply that transformation to the segmentation masks, the images aligns well in the napari, however, when I extracted the registered images and plot with matplotlib, I found they were not matched, do you have any suggestions? Thanks!

```python
      xenium_sdata = SpatialData(images=img_xenium,shapes=shape_xenium)
      nano_sdata = SpatialData(images=img_nano,shapes=shape_nano)
      affine = align_elements_using_landmarks(
          references_coords=xenium_sdata["landmarks"],
          moving_coords=nano_sdata["landmarks"],
          reference_element=xenium_sdata["DAPI"],
          moving_element=nano_sdata["DAPI"],
          reference_coordinate_system="global",
          moving_coordinate_system="global",
          new_coordinate_system="aligned",
      )
      affine
      def postpone_transformation(
          sdata: SpatialData,
          transformation: BaseTransformation,
          source_coordinate_system: str,
          target_coordinate_system: str,
      ):
          for element_type, element_name, element in sdata._gen_elements():
              old_transformations = get_transformation(element, get_all=True)
              if source_coordinate_system in old_transformations:
                  old_transformation = old_transformations[source_coordinate_system]
                  sequence = Sequence([old_transformation, transformation])
                  set_transformation(element, sequence, target_coordinate_system)
      
      postpone_transformation(
          sdata=nano_sdata,
          transformation=affine,
          source_coordinate_system="global",
          target_coordinate_system="aligned",
      )
      img_nano_aligned = nano_sdata.transform_element_to_coordinate_system('DAPI','aligned',True)
      img_xenium_aligned = xenium_sdata.images['DAPI']
```

Here are the images that I got with matplotlib Screenshots img_nano_aligned img_xenium_aligned aligned images in napri(nanostring DAPI is colored with red and xenium DAPI is colored with blue)