An In-Depth Look at Background Extraction in Siril
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- เผยแพร่เมื่อ 22 ก.พ. 2023
- In astrophotography, unwanted gradients can often creep into your images, obscuring important details and diminishing the overall quality of your work. Luckily, Siril's background extraction functions provides easy and effective ways to remove these gradients and achieve stunning, professional-grade astrophotos.
In this tutorial, I'll guide you through the process of using Siril's background extraction functions to eliminate gradients and create a clean, clear image that highlights the celestial objects you're photographing. From selecting the appropriate interpolation method to adjusting parameters like smoothness, degree order, and samples, we'll cover everything you need to know to get the most out of this powerful tool.
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Great tutorial. Thanks.
Comment: For integration >30 min, a Seestar produces a lighter diagonal band with dark corners due to field rotation artifacts. To hide these, I use the Siril Background Extraction tool --- more than once before stretching. I often use it once w/o dither and then 2-5 times with dither. It really helps.
One thing I noticed is that if you aren't careful the background extraction will remove large areas of diffuse nebulosity. You might not even know they were there because they were hidden by sky glow or light pollution.
I love your pace, depth of explanation, and topic focus. Very helpful. Thanks.
Thanks!
As a newbie to Siril your tutorials are a great help 👍
Glad to hear that! Thanks!
Great tutorial...
Thank you!
Great video. Nice to see each feature explained, appreciate you taking the time to do that 🙂
Thank you!
Your videos are so great. Thank you!
Thanks so much!
At last, a correct explanation of this feature. Much appreciated, liked & subbed.
Thanks and welcome!
Thank you so much! Really good job!
Thank you!
Another great video. Thanks.
Thanks! Glad you enjoyed it
Excellent video. This has helped me immensely. Very thorough. The dither option is very useful. Thanks!
Thanks! Great to hear it was helpful!
Awesome tutorial!
Thank you!
Hi, great video. BTW, I found your tutorials very informative, thank you !,
You're welcome! Glad they were helpful!
I tried Siril a little while back and didn't get on with it. Since hearing that they incorporated Starnet I thought I'd give it another shot.
If it wasn't for your videos I may have given up on it again but you got me through. I've way more to learn but now I know where to find the help and I'm enjoying it.
Many thanks!
Thank you so much! Happy to hear they are helping!
Have to agree. The guy’s somewhat of a public service as quite a few are. It’s a nightmare trying to find your way around these software packages with their help. Imagine what it would be like without.
I am still not sure if you are selecting bad background you want Siril to correct or good background you want Siril to apply to the whole image?
The samples are telling BGE where the background is, good or bad.
What Bortle skies are you taking most of your shots from? They look very clean
Thanks! Bortle 4.5-5.
Hiya Rich . I like placing the BE points manually for the exact reasons you mentioned but I do have a question . Some DSO images will eventually reveal faint dust clouds and bands after processing . Will incorrect BE point placement cause this Data to be removed in this step ? I’m worried I’ve been sabotaging my images .
I've actually experimented with what you're asking before. First, it would never completely remove the data. BGE simply creates a synthetic background based on the sample points. A few on the dust, etc. shouldn't cause any noticeable issues. Lots of samples on the DSO or surrounding dust and you will lose data in the sense that it'll wash out/blend with the background. You'll still see those areas but not as they should be. Best advice is to play with it. Place samples where they shouldn't be a have BGE compute the background, then compare that to proper sample placement. Hope that helps.
@@DeepSpaceAstro Thanks Rich . I'll give that a try ./SRK
I’ve just tried out using it manually since, everytime I generate otherwise, when i come to right click to remove points I don’t want, Siril crashes and it’s ‘start over again from scratch’. So, doing it manually, I then just sprinkle points around the perimeter of the image and it appears to do a decent job with just 30 or 40 points.
If you're on a Mac, it's a known bug and will be fixed in the next release.
@@DeepSpaceAstro Ah! Good to know it isn’t me just being a dick again! Thank god for that!
What if you would've done all this in RGB instead of green channel only? The result would be the same?
So first of all, this video was shot using v1.0.6 which did not allow you to work on the RGB channel. The new version 1.2.0 currently in beta however does. To answer your question, yes the result would be the same.
@@DeepSpaceAstro Thank you so much☺️
Great tutorial!
Thank you!