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(@pcyvr)
Molecular Cloud Customer
Joined: 1 year ago
Posts: 5
December 30, 2020 22:34  

After calibrating and normalizing a stack of subs, I opened one of the subs and the "l-c-r-normalised" view.  I'm not sure what I'm supposed to see (haven't been using APP for long) but was surprised by the bands of different colours running across the image.  Can someone confirm if this is expected?  I didn't see any trace of these bands in the final integration (also attached). 

SADR l c r normalised St
Sadr lpc cbg St DeNoise small

 

This topic was modified 9 months ago by pcyvr

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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3694
December 30, 2020 23:05  

I'm having trouble seeing the first picture, could you try uploading it once more?


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(@pcyvr)
Molecular Cloud Customer
Joined: 1 year ago
Posts: 5
December 30, 2020 23:31  

I just updated the original post.  Thanks!


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3694
December 31, 2020 11:30  

Thank you! Ok, so that doesn't look familiar to me. It should be the linear, calibrated, registered and normalised mode. I guess you had all calibration files  etc. loaded?


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(@pcyvr)
Molecular Cloud Customer
Joined: 1 year ago
Posts: 5
December 31, 2020 20:30  

I had a MasterBias, MasterDark and BPM loaded.  I think I've narrowed things down.  If I select HaOIII-Color for the algorithm at Step 0 and Bayer/XTrans Drizzle for the integration mode in Step 6, I get stripes on the normalized data...

SADR RAW 16 1x1 300s 014 St HaOIIIColor BayerDrizzle

But selecting HaOIII-Color at Step 0 and Interpolation for the integration mode in Step 6, everything looks OK...

SADR RAW 16 1x1 300s 014 HaOIIIColor NoDrizzle

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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3694
January 2, 2021 13:37  

Ah, thanks for testing that. That might be an issue and I'll forward that to Mabula.

edit: Just had a discussion and this is in fact normal. It may not be super informative, but it shows the drizzling in effect per frame basically. The fact that some regions have less data is exactly why drizzling also causes a bit more noise. That's how the algorithm works and you'll get different patterns when you change the droplet size for instance. I don't use it often and never really tried this view in particular, which is why I didn't recognize it. 🙂


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(@pcyvr)
Molecular Cloud Customer
Joined: 1 year ago
Posts: 5
January 2, 2021 18:00  

Thanks so much for looking into this.  Good to know that this is expected behaviour.  


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