For extreme cases you have the possibility to combine both transition corrections.

1. In the Parameters tool click on the New Output button.
2. Activate the checkboxes Correct Shading and Fuse Tiles.
   
3. Under Image Parameters in the Input tool select the tile image for the stitching and the reference image for the shading correction.
4. Click on the Apply button.

1. Both settings will be applied to the image. With this method you will receive a perfectly stitched image with no visible transition areas between the tiles anymore.