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Problem with image brightness after integration  

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(@piotrczerski-org)
Molecular Cloud Customer
Joined: 7 months ago
Posts: 3
March 10, 2020 21:00  

Hello,

I have a problem with too bright image file after integration process in the newest version of APP. Please take a look at the attached pictures. This is the same material (L-eNhance pro + H-alpha data) integrated in the one of previous versions and in the 1.077. The first one is quite OK, M42 core not overexposed and ready for further stretching. The second one done in the newest version is brighter with the core and stars overexposed. I see that there are some automatic settings in the 1.077 comparing to previous versions, so maybe I've done something differently what caused this problem with the integrated image. Could you help me with this please?

Regards - Piotr

M42APP1
M42APP2

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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1738
March 14, 2020 14:53  

So the first one is stretched less I assume, or it's related to the RGB-Combine issue we've had in the previous version. The new version does this correctly. To manipulate the overall stretch, you can play around with the tools on the right of your screen, where you can select various stretch parameters etc.

Your result does look a bit strange though, if the above doesn't work I might ask you to upload some data for us to have a closer look.


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(@piotrczerski-org)
Molecular Cloud Customer
Joined: 7 months ago
Posts: 3
March 19, 2020 02:09  

Thanks Vincent. Both are unstretched photos and saved in such way but the first is after integration in 1.075 and the second one (brighter) stacked in 1.077. I wonder why the same subs can differ after integration in both versions. I believe I used the same settings in those two but let me do this again and send you results if this happens again.

Regards - Piotr


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1738
March 21, 2020 18:47  

Mmm, yes that would be interesting. If it remains I'll ask you for the files to have a look myself.


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(@piotrczerski-org)
Molecular Cloud Customer
Joined: 7 months ago
Posts: 3
March 22, 2020 16:57  

I have another example - the first image is completely unstretched, right after integration in 1.077. I use usual settings - mostly automatic from this version:

St avg 50400.0s AR LN 8.0 4

The second one (the same subs) integrated in 1.075. I stretched it a bit to show another issue as you can see the color balance is ok but what is this brownish color in the backround?

St avg 50400.0s WC 1 3

My master flats, darks, and bias look normal as well as my lights. Please see the original files here: https://drive.google.com/open?id=1T4pJ5VdDhWoHLMiEkbnXm_duXpHMRDJ3

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Regards - Piotr


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(@astrogee)
Red Giant Customer
Joined: 2 years ago
Posts: 84
March 23, 2020 13:10  

The plot thickens... 🤔ย 


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1738
March 23, 2020 15:06  

Thanks for uploading, downloading them now and will let you know if I can see what's going on.


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1738
March 30, 2020 10:27  

Hi Piotr,

Checking your data now. Couple of things I notice;

- Your masterflat details show me you took them at 0,005 seconds each. Is that correct? They should be around a second and you need to get the brightness down to be able to do that while taking them.
- Related to this, I still see what looks like a dust patch on the lower right? This might indicate your flats are not working correctly. In such a case leaving them out will produce a better result, did you try that?

- The bright background looks like light pollution to me. It may be a good idea to check a single sub instead of the integrations, do you have a good single Hydrogen Alpha and LPS sub for me?

Below I used the LPC tool to try to get rid of some of the signal in the background and you can see multiple rings and such. Also the H-alpha doesn't seem to add to the result, I think something is going wrong in your processing or with the data itself.

Screenshot 2020 03 30 at 10.39.47

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