LRGB, Selective Rejection, and DBE

[ngc1535]

Hi all!

I made a guest appearance on the Astro Imaging Channel last Sunday and presented examples concerning rejection, LRGB, and DBE.
As the presentation was done Live... it is of course filled with all kinds of little "issues." So I made a page that shows the recording as well
as some additional information:

https://www.adamblockstudios.com/articles/Astro_Imaging_Channel

 In particular I did not feel my LRGB part of the broadcast was good... I ran into problems! So at the page above I am making my LRGB section
public to "make up" for it. That being said, where else would you see a demonstration that includes "poop" emojis and PixInsight??

I hope you enjoy the material and find it useful.
Thanks!
-Adam

[RickS]

Thanks for that, Adam.  I enjoyed watching both videos and learned a thing or two.

I don't know if you remember it but we had a discussion in the PI Forum a while back where I mentioned that I always write 1s over satellite trails to make them reject out and I couldn't remember why I did that instead of writing 0s.  Your rejection technique jogged my memory... writing 1's doesn't seem to produce the edge artifacts that your selective rejection technique removes with Large-scale Pixel Rejection.

Cheers,
Rick.

[ngc1535]

Hi Rick,

Yes, I remember. My comment to that was that I suspect the same effect is occurring...but at the high end 1's become values that though less than one- are still outliers. The kicker is that you are using up some headroom at the top end to reject the edges (statistical rejection, not range) that could have been left for "real" outliers. The large fluctuations on the low end are much less likely- so zeros make sense to me. Nonetheless, it is also a great demonstration of what the large scale rejection rejection feature is doing.

-adam