Hi Gordon.
In registax 3, the "create reference frame" button is in the "optimise" tab. It's used to create a "better" reference frame so that registax can align and choose the best images from your avi.
The sequence I use is as follows:
1. Select alignment frame, click "Align" then when it's finished, click "Limit".
2. In the Optimise tab, click "Create Reference Frame", and it will align and stack a sample of 50 or so images, which you should then do some mild wavelet processing on.
3. What that does then, is use that mild processed version as the reference frame to compare all the other against, so that it will find the frames that look the most like the final result you want.
4. Once you've done your mild wavelet processing, click "Continue" which takes you back to the Optimise tab.
5. Click "Optimise" and let it do it's think.
6. Go to the "Stacking" tab, and use the StackGraph to select the # of frames you want to stack, click "Stack".
7. When that's done, go to Wavelets tab and do the more aggressive processing to make the image look how you want it to.
Hope that helps, let me know if you need any more assistance.
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