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I do a quick visual on each sub which really doesn't take long (used to use CCDStack but mostly I use the PixInsight Blink process these days.) This weeds out any cloud affected subs or guiding catastrophes.
Next, I use the PI SubframeSelector script to analyse FWHM, Eccentricity, SNR, etc. in each sub. I toss out the really bad ones and plug in a formula to calculate a weight for each sub. By default, PI image integration is noise weighted but I like to include FWHM and Eccentricity in the weight calculation. This trades off some SNR for improved detail.
Cheers,
Rick.
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