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Nettie, that type of artifact looks like it could be one of two things.
1. You are using multiple alignment points and the alignment "boxes" are too close together or overlapping. try spacing them out or using smaller alignment boxes.
2. You have some dropped frames in your video which are included as black frames. MY DMK used to drop dropped frames completely from the video, buit I notice with the newer drivers it keeps them in there but they are black. There's a couple of things you can do here:
a. If you are using a webcam type camera, make sure your HDD has plenty of free space and is defragged. I actually get rid of all my previous session files off my lappy so it doesn't waste time looking for a clear sector (which may cause dropped frames).
b. Once you have dropped frames in your video, try alternate initial alignment frames to see if you can stop registax from picking them up. Also try making a reference frame from say the best 10 frames before optimising. Often I find the reference frame will pick up dropped frames, but the final optimisation pass won't. It doesn't work all the time, but you try all sorts of thing to recover data, don't we?
As for the number of frames selected, where are you telling to select the best 2000? Are you using registax 6 (cause I have no experience with it yet)? registax will usually cut off at a specified quality, but you can over ride it by manually moving the cut off slider before you select Limit on the Align tab.
Al.
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