This is a typical result from my imaging. I have yet to find the magic combination of little green blocks to reduce the gradient. The combinations both automatic and manual seem to move the gradient from on side of the image to the other without revealing much detail. Help will be greatly appreciated.
Thanks in advance.
result.tif (43.2 MB)
Hello. Did you read this tutorial: Siril - Removing gradients
Thanks for the link. I have read it and now experimenting with different iterations. Reviewing other tutorials and general astrophotography articles, I see that the addition of dark frames may make it easier for the Background Extraction function to remove gradient. Siril is a great tool. The 1.2 version is a super upgrade.
Some people say you get better results by first removing the stars and then do background extraction.
Thanks for your reply. Just throwing this out there hoping for some help.
So this is what I’m looking at:
NGC 2174
41x240sec lights 800 ISO
no cal frames
Script stacked Siril
GHST x2
Hardware:
Celestron C8
Celestron .63 reducer
Canon 60D
AVX Mount PHD2 tracking
Dew shield
Dew heater around corrector end of scope
Data capture with APT
Rural clear dark sky. No moon.
Comments suggestions welcome.
Thanks to all.
Hello. You clearly have a flat issue. It is always difficult to fix a flat issue.
The best I can do
I spent some time on your monkeyhead. I don’t understand where that circular gradient comes from as I’ve never seen it in my workflow. I did photometric color calibration and gradient extraction in Siril and some processing with the 3 Xterminators and Photoshop.
Thanks to lock042 and Indysbike for taking the time to look at my image. This is my final image processed using Siri 1.2.0 Beta 2. Photoshop was used to tweak the image and run through Topaz DeNoiseAI and more hours in front of the computer than I care to mention. Over on Cloudy Nights responses to help suggested using calibration frames. My learning curve just got a little steeper.
