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I did a CCDStack vs PixInsight bakeoff about a year ago for my own amusement. I did calibration as well as registration and stacking in each of the packages. I didn't use make an attempt to use the same registration algorithms in both (IIRC, I used Bicubic B-Spline in CCDStack as recommended in Adam Block tutorials and the default in PI). I saw a 5-10% better result, measured by FWHM, from PI over a few examples.
If I get some time I'll redo my tests under more controlled conditions...
Cheers,
Rick.
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