PixInsight: Normalize Scale Gradient v1.3 question

[Lee_P]

I'm trying the new Normalize Scale Gradient for the first time. It's v1.3. I kept all settings as default. When I reached the Integration stage, about half of the images in my stack had been set to red crosses rather than green ticks. Any idea what's going on with that? It seems like it's trying to exclude a huge amount of data from the final stack. I ran all the subs through Blink and SubFrameSelector in advance and already weeded out the chaff, so I'm surprised that's the case. Any help about this issue would be appreciated, along with any general tips about how to best use Normalize Scale Gradient 😁

[Lee_P]

Ah, looks like this is actually discussed at the beginning of this video: https://www.youtube.com/watch?v=6kyGA91uoIA