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Steve
Once your video frames have been Analysed (2) a Quality Graph is displayed showing best frames to worst frame ( left side to right side )
The green quality line on the graph starts on the top left best frame and falls away to the bottom right at the end or worst frame
The four segments of the quality graph do not correspond to the four frame percentage boxes in Stack Options
I usually find if I pick a point in the quality graph where the green line passes the 50% horizontal line or just past it , I usually get the best frames to stack. It usually ends up being around 20% to 40% in the first box. So I point the mouse at that point and press CTRL and right click to automatically place the value in the first box. I leave the other 3 boxes blank
Alternatively you can manually guess the best frames by selecting different percentages in the boxes. There’s no hard and fast rule but I wouldn’t use 4 boxes as there’s no benefit in fact I find even using 3 boxes with different stack percentages result in a similar quality stack but don’t let me sway you from using 3 boxes with different values
So for default values I mentioned in my basic user guide to use 25% in box 1 , 50% in box 2 and 75% in box 3 , that way you get a good balance across the whole video and therefore can compare stack results
Things like seeing conditions, atmospheric turbulence, number of video frames and stack percentages all are variables so you have to experiment. After a season or two you get to know your equipment, video files and the right parameters for Autostakkert 3
Good luck and have fun !!
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