To open the Resampling Preferences page,
click 
on the Image Registration toolbar and
select the Resampling tab.
Points Preferences (Image Registration)
Use the options on this page to control the settings for calculating and appltying the image registration.
To open the Resampling Preferences page,
click on the Image Registration toolbar and
select the Resampling tab.
Other parameters can be set for point tracking and drawing the markers. These are handled in the Marker Preferences dialog. The preferences for markers used in image registration are described below:
The Sample Radius defines the distance from the target point within which points are used to compute the centroid position. A reasonable starting point for choosing a value is 2 times the FWHM (note that FWHM is a diameter and this parameter is a radius).
The Tracking Radius is used when computing the centroid of an Image Set. This value defines the maximum offset distance Mira will search in the next image to lock onto a new centroid position.
The Track Centroids option controls the duplication of markers when the positions are "tracked" through an image set. If Track Centroids is checked, the positions are centroided in every image.
Centroid positions are computed using image data, not the screen display. Choose Positivepoints or Negative points based upon the type of object to measure rather than the palette or other image display attributes. For modern, inherently digital images, you will almost always choose Positive points. For scanned photographs, however, you may be working with a negative image and would choose the NegativePoints option.
Image Registration Preferences, Background Preferences, Marker Preferences, Centroid Measurements