Reference Image question

[dnewbury]

I have 3 narrowband stacked images - which I stacked some time ago but have not got around to combining until now. It looks like 1 of the images is not aligning to the other two. I *thought* I had used the same reference frame for all 3 when stacking - but guess not   

Is there a way to identify which reference frame was used for each stack? What options do I have short of re-stacking everything from scratch?

Thanks,
DaveNL

[aworonow]

You could re-register 2 of the stacks to the third very quickly.

Alternatively, if the 3 stacks are part of a project, the history of those frames probably has what reference frame(s) were used.

Alex

[dnewbury]

Alex,
Thanks for the input.

Unfortunately, the project file I have does not go back to the time when images were registered/integrated. 

If I don't know which image was reference frame for the "3rd" stack. How would I be able to re-register the other two, to match? I think I am missing something?

DaveNL

[RickS]

If you have the original data then I'd just go back and register/stack it all again, but if you don't want to do that you can do what Alex suggested (though I'd recommend you only re-register the one master that doesn't match the other two - the interpolation will damage the data slightly, so it makes sense to only do it to one master rather than two.)

Use StarAlignment with one of the "good" masters as a reference and apply it to the "bad" one.

Cheers,
Rick.