Two or Three Stars Registration (deep-sky)
This method is particularly well-suited for lucky imaging, as it does not require as many stars as Global alignment but can cater for rotations between frames.
Thanks to two or three stars being used, images are aligned using a similarity transformation, i.e. two shifts on X and Y, one rotation and one scale.
Tip
A new sequence is created as an output to this step.
If the initial sequence was a CFA SER opened with Debayered
option checked, the resulting SER is a RGB SER.