Problem with star reducer tool

Hi @volkanovun,

You need to set the star size lower than 100%, like 50% or 66% like you did and then use much smaller correction radius like 1.0 and halo settings like 0.5, and check if that is better?

We do know that the tool is not working perfectly on color data like this, we have on our list to add more improvements for sure.

Mabula

Hi @mabula-admin ,

Thanks for the settings advice. Well, there is no strange halos anymore but reduced stars left ugly marks like chicken pox. I look forward for the fixed star reducer tool.

Volkan

Hi @volkanovun,

What settings did you use this time? I just tried on similar data, SHORGB composite with diffraction artefacts in the bright stars. If i play a little bit with the settings for the radius and the halo i get very good results I think:

orginal zoomed in:

star reduced with the settings as shown in the tool:

Here are 2 JPGs of the entire field of view of this SHORGB of the Rosette Nebula, processed by myself from iTelescope.net data:

We know that we need to work on the spikes in the bright stars, that is on our todo, the correction of the weaker stars works very well, doesn't it?

I do need to ask, are you running the star reducer on linear or stretched data? You really need to do it on linear data, I know it does not work as good on already stretched data. The calculations in the tool assume that the data is linear as does almost everything in APP for good reason.

Maybe you want to share the linear FITS file of your data so I can test myself and maybe fix the issue with your data somehow?

Mabula

@mabula-admin 

Hi Mabula,

Well, my settings was as follows as you adviced:

Correction radius 1,0

Correct star halo : 0,5

Star size : %50

Peak intensity : %100

threshold=K noise K003

I heard/read about linear data story first time. All videos I watched describe using star reducer tool on streched data. So this bring us to a very old story: user manual.

I tried above settings on linear data but it did not helped. I'll send you the linear data. Thanks

Hi Volkan @volkanovun,

I do not know what videos you have looked, but we have never recommended to do any processing with tools like this on non-linear data. If there is a video using APP recommending non-linear data, than better disregard that source 😉

Anyway, yes, please upload your data then here and I will test and try to improve the tool going forward:

https://upload.astropixelprocessor.com/

username: uploadData

password: uploadTestData

Please create a folder like Volkan-starReducer-issue

and upload the data there and let me know once uploaded.

I have added your data to my issuelist for upgrade of the Star Reducer Tool.

Thanks,

Mabula

Hi @mabula-admin ,

It was in youtube. Whatever, I uploaded the fits file.

Cheers..

Thanks Volkan @volkanovun,

It is on our list to check the data and add improvements in the star reducer 😉

Mabula