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Too Much of a Good Thing?
To be most useful, you can scrub through your shot and look for the worst frame, where the output rectangle has the most missing, and adjust the POI position on that frame.
After you do that, there will be some other frame which is now the worst frame. You can go and adjust that too, if you want. As you do this, the zoom required will get less and less.
There is a downside: as you do this, you are creating more of the shakiness you are trying to get rid of. If you keep going, you could get back to no zoom required, but all the original shakiness, which is of course senseless.
Usually, you will only want to create two or three keys at most, unless the shot is very long. But exactly where you stop is a creative decision based on the allowable shakiness and quality impact.
Warning: SynthEyes uses spline interpolation between keys. If you have keys close together, other frames may have surprisingly high values. If this is likely or already happening, open the Graph Editor before the Image Preprocessor.
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