2 replies to this topic

[Maximum Astronomy]

Hey everyone!

I absolutely love my Origin but I am really struggling to figure out how to stack and post process with this data. I seem to have some issues with the different software I try to combat the issues and I'm hoping those with more post processing experience can help point me in the right direction.

 

First off a couple nights ago I went out and did a full 1-hour imaging run on the Needle Galaxy just to try out some new things. I was doing 1-minute exposures and I took all the applicable calibration frames and have those in the folder to post process. If I try to use DeepSkyStacker it barks at only 1 dark and 1 flat frame so it won't let me proceed further. I tried with Siril script that works decent, but sometimes fails to "see" the stars in the photos to calibrate on. So I turned to APP and Pixinsight to try and stack successfully. Well, they do work, and I've tweaked some settings to try to mitigate the walking noise issue I'm having. The newer bayer pattern for Origin is GBRG, and this is the result below...The walking noise is ALL OVER to stacks from APP and PI, but yet the Origin stack itself has none of the walking noise, just a regular noise pattern. I've attached a photo so you can see what I'm talking about. Furthermore the PI stacked photo seems to be in mono even though I selected the applicable bayer color pattern for Origin. So that's perplexing to me as well.....

 

Some suggestions would be very welcome on how to combat this and I am happy to provide the data as well in a google drive you can play with it. 

 

 

https://drive.google...?usp=share_link

 

I appreciate it! I've been tinkering with this now for a week and I can't make any progress or headwind on this one....even following guides, YouTube videos, etc, nothing seems to work sadly....

 

Thanks

Max 

Attached Thumbnails

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Edited by Maximum Astronomy, 13 May 2025 - 05:11 PM.

[CraigR]

I ran your data through APP, GraXpert, and Siril. I did only the basics in Siril. For example there's the typical noise in the corners that I assume is field rotation. I would crop that out but I left it in just so you could see it. Here's my final result.
 


 
I stacked in APP. I had to check a box in step 0 "force Bayer-X-trans CFA" because it seemed to not understand this was color data.
 
It didn't like your flats. Don't know why; it just said they couldn't be used. Rather than figure that out, I removed them.
 
It wasn't able to register one of the frames so I left that one out. Normally I might experiment with parameters to see if I can get it to register, but I figured 59 minutes wasn't going to be much worse than 60 so I just omitted it.
 
I did the normal background extraction and denoising in GraXpert. I use the AI models at 80% for both of those.
 
In Siril with autostretch it looked pretty noisy but sometimes that happens with autostretch. At least for me. I removed the stars, then did some histogram stretching on the starless background, then a little hyperbolic stretching. The background really wanted to be noticed so I had to be careful not to stretch too much. Adjusting the black point without losing detail did the trick. For the stars I did my normal desaturate and resynthesize. The star shape was not that great according to APP, ranging from .44 to .88, so I figured resynthesize would solve that.

After combining the stars with the starless background I did +1 color saturation with background factor set to 0.
 
I am not an expert on calibration frames, but it's my understanding at least for darks and bias frames that you need to do several, then stack those. I don't shoot flats, so I don't know about those. I'm also under the impression that sensor temperature matters when shooting calibration frames, and I don't think the Origin has a cooled camera. The fits file I looked at had a temperature around 20°C. I don't know what standard practice is with the Origin and I don't have one, so you may have to do more research.

[jprideaux]

I was a little surprised to read 1 minute sub-exposures with the Origin (I assume in alt-az mode). Unless you are really far North (or South), you may suffer field rotation for that length of sub-exposure. That might have complicated done things in the processing. I have not looked at your data yet, though. The origin will soon offer wedge use for EQ-mode so then 1-minute sub-exposures should be fine.