To open this dialog, click 
on the Image Registration Toolbar (see the
Register Images
command).
Image Registration Preferences Dialog
The Image Registration Preferences dialog is used to configure the image registration process. This dialog has 2 pages for setting preferences related to resampling the images and those related to setting the background of the registered images. Other preferences related to drawing and placing the markers are opened from the button. This button opens the Marking Preferences dialog.
To open this dialog, click on the Image Registration Toolbar (see the
Register Images
command).
When you are finished making changes, click [Apply] or [OK] to accept the changes. Click [OK] to both accept and close the dialog..