Removing/reducing BIG halos in RGB

Questions and answers about processing in StarTools and how to accomplish certain tasks.

Removing/reducing BIG halos in RGB

Postby goldspider » Thu Nov 28, 2019 12:56 pm

I've got some large halos in my M45 data that I'd like to process out (or prevent entirely, but that question is posted on CN).

I've attached a screenshot showing an AutoDev done on my RGB data. The mostly-green halos around some of the brighter stars are very evident. Are there any modules in StarTools that can isolate and reduce them?

Thanks!
goldspider
 
Posts: 7
Joined: Wed Feb 22, 2017 3:38 pm

Re: Removing/reducing BIG halos in RGB

Postby admin » Fri Nov 29, 2019 1:56 am

Hi,

I cannot see the image you attached - would you be able to attach/upload it again?
Thank you!
Ivo Jager
StarTools creator and astronomy enthusiast
User avatar
admin
Site Admin
 
Posts: 1921
Joined: Thu Dec 02, 2010 10:51 pm
Location: Melbourne

Re: Removing/reducing BIG halos in RGB

Postby goldspider » Fri Nov 29, 2019 3:42 am

admin wrote:Hi,

I cannot see the image you attached - would you be able to attach/upload it again?
Thank you!


Let me try this again...
Attachments
halos.jpg
halos.jpg (504.6 KiB) Viewed 230 times
goldspider
 
Posts: 7
Joined: Wed Feb 22, 2017 3:38 pm

Re: Removing/reducing BIG halos in RGB

Postby admin » Fri Nov 29, 2019 4:13 am

These are more than likely secondary reflections.
To fix these in post processing tends to be tricky, but not always impossible... Would you be able to upload the dataset?
Ivo Jager
StarTools creator and astronomy enthusiast
User avatar
admin
Site Admin
 
Posts: 1921
Joined: Thu Dec 02, 2010 10:51 pm
Location: Melbourne

Re: Removing/reducing BIG halos in RGB

Postby goldspider » Fri Nov 29, 2019 2:12 pm

admin wrote:These are more than likely secondary reflections.
To fix these in post processing tends to be tricky, but not always impossible... Would you be able to upload the dataset?



Yeah I figured that was what those were; maybe from the filters? I'll be looking into this some more.

I'll upload the data to my Box account and post back with a link to it.
goldspider
 
Posts: 7
Joined: Wed Feb 22, 2017 3:38 pm

Re: Removing/reducing BIG halos in RGB

Postby goldspider » Wed Dec 04, 2019 5:10 pm

Here's a Box link to a folder containing my LRGB stack files.

https://psu.box.com/s/g6oidesl10mdtkckaapdlgzvd4roaz6p
goldspider
 
Posts: 7
Joined: Wed Feb 22, 2017 3:38 pm

Re: Removing/reducing BIG halos in RGB

Postby admin » Fri Dec 06, 2019 4:45 am

goldspider wrote:Here's a Box link to a folder containing my LRGB stack files.

https://psu.box.com/s/g6oidesl10mdtkckaapdlgzvd4roaz6p


Thank you for uploading that. It appears the issue is primaily visible in the green channel and not (at all?) in the luminance data. So this may well be an issue with your green filter.
The solution then, is to process this as straight LRGB (or L+Syn L, RGB where the green is not added to the synthetic luminance).

A really quick process with ST 1.6 gives a reasonable result with the green halo barely visible;

NewComposite.jpg
NewComposite.jpg (406.9 KiB) Viewed 87 times


I'd say this is an encouraging result. Does this help?
Ivo Jager
StarTools creator and astronomy enthusiast
User avatar
admin
Site Admin
 
Posts: 1921
Joined: Thu Dec 02, 2010 10:51 pm
Location: Melbourne


Return to Image Processing Troubleshooting

Who is online

Users browsing this forum: No registered users and 2 guests

cron