Introducing Siril

[@StevesharpphotographyCoUk]

Excellent video which is opening my eyes to the art of stretching which is a critical part of astrophotography

[@alisonfairley5444]

Thank you very much indeed Gary for this intro. Excellent and very informative. Appreciated :-)

[@flyfisher8475]

I’ve been looking for help with Siril. Thank you so much. Excellent tutorial. Looking forward to the future videos. I like your presentation style. Nice detail.

[@BorealisLite]

Thank you for the kind words. I'm neither an actor or director, but glad the message gets through.

[@markrostek534]

This is great I am a beginner and was struggling with siril this helped so much thank you!!!

[@tonybailey3944]

Hi BorealisLite, thank you for the excellent intro to Siril, well explained & nicely composed 👍 . I stumbled on this just after finding Siril & downloading it as an alternative to DSS & Photoshop & at this stage it looks very promising. I'll check out your next tutorial & do a trial stack & I'll probably have a bunch of questions to ask you 🙂. Clear skies, Tony

[@BorealisLite]

Thank you. There is more to Siril, planning at least one more with some of the more advanced stuff. But I like a lot how easy it is for stacking & basic linear ops. Regards.

[@avecforte8851]

Oh, just found this video. Looked at the one after this and asked some questions, maybe they get answered here :)

[@BorealisLite]

Let me know if anything is unclear, I tried my best to work through it methodically. Regards

[@terrencebranscombe3257]

Thank you, BorealisLite, for sharing your hard earned knowledge of SiriL workflows for us unilingual anglos. It's a well thought out and executed series, which I hope you keep going with as interest and energy allows. Perhaps I simply overlooked it, but I wonder if you could fill in the blanks for me on how, exactly, you might have used SiriL to create the master bias and master flat files that you refer to in this and the previous video? I concluded from these two videos that you simply convert the raws, provide a sequence name, and stack 'em; but, are there any intermediate steps or decision points that would improve these master files? Thank you!

[@BorealisLite]

Hi Terrence, for simplicity's sake I suggested taking all your calibration frames and light frames and running the full processing script once or the "OSC_PreprocessingNoDarks" script once. When it is done, there will be all the sequences and intermediate stacked calibration frames in the process folder. I just copied the bias_stacked.fit file from there into the biases folder, and the pp_flat_stacked.fit file into the flats folder. Then you could use any of the scripts I wrote that use masters if you are processing in the future a set with the same ISO and lens. The biases are a simple stack, the pp_flat_stacked file is a stack of flats with the bias subtracted out. There is a readme with the scripts linked in the description that explains all this. The idea is with a dslr to re-use those files because with a lens there is no lens rotation between sets and it seems rare for internal dust in the system to move around. I also should mention that if you take dark flats with an astro cam, that they are essentially the same as biases, and can be used that way. Everything has changed for me now, I have a ZWO cooled cam and a small scope. In this setup I can build a dark library because of the cooling, just need a master for each exposure length. But with the scope, the flats & dark flats will have to be re shot every time because the camera will not necessarily be in the same rotation with the scope each time and dust can move around in an system that gets opened every time I set up to shoot. As a result I will do a new video soon and release scripts designed for master darks & for new flats each time. The link in the description is to a folder on Google Drive. Any new scripts will be in the same folder at that time. Hope this helps. Clear as mud, just trying to get people with a simple DSLR/lens setup to a level that makes it easy to get a great result. Cheers

[@terrencebranscombe3257]

​@@BorealisLite A heartfelt thank you for such a fulsome and detailed reply. It's a fabulous guide for those of us who are easily perplexed. I did watch your later video that went through the manual steps of a stack, and feel now I can use your scripts with some confidence that I know (a little) of what's going on under the hood. Thank you again, and clear skies.

[@bernym4047]

'stretch' 'in linear state' used without clarification straight after the intro?

[@aniketlande7436]

Can we process a milkyway photo with foreground element using SIRIL? I could not find anything on that.

[@BorealisLite]

Hi, good question. Siril is not designed for that, but I have tried it. With my images Siril was able to find aliignment stars in the sky portion of the image, and then to stack the images for a sky image. For the foreground, if you wish to stack, it is easy. Just convert the images, which creates a sequence, skip the registration, and just stack the lights to get a forground image. Or, if you have calibration frames just run the appropriate script, but when you go to stacking be sure to select the pp_light sequence first, not the r_pp_light sequence. Those are not registered or aligned, so perfect for foreground. I am thinking about doing a video about that, but have to get past tax filing time here in Canada first. Cheers

[@aniketlande7436]

@@BorealisLite thankyou very much. I'll try it again. So registration is to register stars?

[@BorealisLite]

@@aniketlande7436 That is correct. You can open one of your converted raw files in Siril, then on the command line type "findstar" That will show you the stars it finds, as long as they are in the sky only it will align on them. I am assuming that you are talking about using tracked shots for the sky and untracked for the foreground?

[@aniketlande7436]

@@BorealisLite understood thanks. I'll update you when I pass. If failed will get back to you with questions 😆 thankyou sir for your time and help