Help me understand Subframe Selector 'plots'

[UlteriorModem]

I like the Subframe selector script. It really helps to separate the wheat from the chaffe.

But one thing I seem to be having trouble understanding is the graph display in plots.

It seems like for some things FHWM for instance the lower numbers are good, others Like weights lower numbers are bad.

Just a little confused about this. Is there a resource somewhere that will help me understand what it is I am looking at?

Thanks!

[aworonow]

If you step back and think about what each variable is reporting, than it should be apparent whether a larger or smaller value is better. For instance, FWHM is a measure of star size. Tighter stars indicate better seeing conditions, so smaller is better. Number of stars is likely positively correlated with seeing: more stars = better seeing.
In fact, most of the measurements are correlated, either positively or negatively, with seeing/imaging  conditions (equal exposures, moon position, zenith distance, ...). In fact, if you just set the image weight  proportional to the number of stars, you'd probably be well off.

Alex

[UlteriorModem]

if you just set the image weight  proportional to the number of stars, you'd probably be well off.

You lost me there 

[RickS]

The SubframeSelector script has documentation that explains what the different metrics mean.  That would be a good place to start.  It even talks about why you might or might not use StarSupport as a measure of quality (as suggested by Alex.)

Cheers,
Rick.