How to Use Spy Glass for Rigid Fusions
Select Spy Glass from the toolbar.
Spy Glass superimposes the second image set in a frame over the first image set.
Position the window ① anywhere over the underlying image.
Re-size or re-position to the desired area and adjust its shape by dragging the corners of the window.
Scroll through the image slices using the arrow buttons ②.
Zoom to your region of interest.
Review and accept the fusion result if it is satisfactory.
Select Done when complete.
The fusion result is saved for further processing.