Hey Rich. Sitting at the bottom of Africa makes it near impossible to get the latest tech and equipment that needs hard currency. The more I am grateful for people like You and Cyril for investing your time and effort in projects like this. Internal thanks :bow: :bow:
Great series Rich, so much more information than other channels and will save me quite a few bucks by not having to purchase Pixinsight. Keep up the good work and I hope your channel grow heaps.
@@DeepSpaceAstro started astrophotography about half a year ago using a tracker and modded dslr funnily enough I'm shooting the lagoon and trifid, going to just keep shooting it for awhile and see what I get. Though since I'm using a camera lens this has helped an insane amount because the stars can be a bit wonky.
Blown away by this. I used in on my Cone Nebula and it worked perfect. Looks like the latest version of the recomposition has separate "Apply" buttons. So, I guess they fixed it from closing? If it still closes, correct me if I'm wrong, but I'm thinking of a work around. After the Starmask is created, I can bring each photo into GHS make them nonlinear so PS can "See" them. Save each as a 16 bit Tiff and bring them into PS. Once finished in there, bring them back and reconvert into 32 bit for Siril and THEN do a Full Resynthesis to fix star issues and finally do a Recombine? Guess I have something to do tomorrow. lol
Absolutely the highest efficiency in explaining how such miraculous functions of SiriL can make one's jaw drop! Thank you so much for your video! The star elongation remedy is totally incredible. Does that mean when shooting emission nebulae, we can have longer exposure without worrying too much about star shapes? Previously, I would shoot 1-min subs thanks to my tracking accuracy. I'm wondering maybe I can try a 3-to-5-minute approach.
You're really advancing the art by providing all of these fantastic tutorials, well done! One question - maybe I missed it; is there a way to control the amount of shrinking the stars get with the resynthesis? I have found that my stars end up looking like perfect white round dots. Did I miss a step? I'd like them to be rounder, but still have the color and a bit more of a "natural" appearance. Thoughts? Thanks again!
Thank you! Use Generalised Hyperbolic Stretch with the Human or Even Weighted Luminance for the Color Stretch Model to help with the star color. You can try to add a bit of blur to the star mask by typing gauss 1.2 (play with that number too) at the Siril command line. Save first because there is no undo when using commands. You could also try my script to shrink the stars. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Na6GzKozpCI.html
Hi Rich. How are you? Is there a way to make it leave certain stars alone? Sometimes it replaces a promient star but makes it look fake (or at least not as natural). I would like for it to leave certain stars alone. I tried deselecting the star, but it ended up removing the star completely when I did that (instead of leaving it alone, it removed it completely). Thanks!
Great video Rich! What do you recommend (if anything) for a star that remains saturated after running the desaturation tool? I've run into this a couple of times where it fixes all but one star. Would you just leave it and continue on, run desaturate again, or is there some other kind of setting I can change for it to fix them all the first time?
@@DeepSpaceAstro Perfect, thanks so much. Thats what I was thinking but I'm still pretty new to this. When do you work on your star processing? Is it one of the last things you do before you stretch or is it better to do it earlier in the process before noise reduction, etc.?
Brilliant thanks again for your excellent informative videos . I really can't afford pix right now and I think my imaging doesn't yet warrant that expense .
Friend of mine gave the link to this video 📹... GREAT!! Tomorrow I'm going to reprocess my M92 result I made during my holiday! Thanks a lot for this video!! 👍🏻
Hi, Rich, I just found your videos and love them. I've been trying to learn Siril and the video have helped tremendously. I was especially happy finding the one about fixing elongated stars. I had great success with it until I tried it on globular clusters; can't get it to work right. It seems to treat the central condensation as a nebula. When recombined the central part of the globular is simply an over blown mess. I'm following your script to the letter but I'm probably doing something wrong Any suggestions?
For saturated stars? If that gets you the desired result, then you could do that. This video was just showing the functions of Siril to help with that. There's almost always more than one way to do things. 😉
@@DeepSpaceAstro i sort of meant in general, but now i realise you were doing it for demo purposes. Really appreciate your videos keep them coming please. Ill catch up eventually such a lot to take in :)
So can we use this for coma aberrations in the corners? If so that converts a whole load of previously unsuitable f1.4 lenses into awesome milky way astro lenses. Im thinking things like the Nikon 24mm f1.4g i loved that lens for everything except astro
Hi Rich. I'm just getting started with SIRIL and your videos are very helpful. I'm a little stuck at 9:30, where you remove the stars. The, "execute" button isn't lit up and can't be selected. Any ideas? Thanks. Tom, Tucson
That usually means you don't have Starnet downloaded and configured properly, or if you do, your processor may not have the AVX instruction set. If you're confident you have it setup correctly, watch this video to see if it's the issue with your CPU. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RLvmcwYX2K0.html
Try drawing a large selection around the center of your image, and then run PCC. You can also try the image plate solver under the hamburger menu, top-right of Siril. If it plate solves, then immediately try PCC after.
Hey Rich. Howzit? ONLY since recently, Siril became very picky with stacking frames. I had many images as the one you showed in the vid, however since I reloaded 1.2 beta it will not stack frames that have even only slightly elongated stars. So a question, how do you get an image with "badly elongated stars"?? I know, I should do manual stacking, but I only recently moved from piles of mussel shells to the abacus, and one of the upsides of Siril is it has automated script. (-; BTW, do have your coffee with milk?
First, I'd recommend installing the latest version of Siril 1.2.0-RC1 although their website is currently down at the moment. Second, take a look at this tip from one of my previous videos and give that a try. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BOVLBVvHTdo.html. Oh and coffee is always black. ;-)
I'm a beginner in Siril! It's a perfect Video, thank you! I've to reduce the speed of the video slightly and must with subtitle watch more often! Best regards from lower Austria!
Sure, avoiding that or reshooting the image will always be the best solution, and I mentioned that briefly in the video. This is just a way to correct the stars if you can't reshoot, like if you went to a dark site hours away, and didn't realize the stars were elongated. You can fix them since chances are you wouldn't head back out to that site again to reshoot. And yes BlurXterminator can do this, but that's only for PixInsight.
Thanks for the time and effort you put into this, I just started using siril thanks to your easy to follow instructions... try to do almost everything in photoshop before, but siril is way better. Thanks again
Wow, that star full resynthesis is unbelievable . Thanks for making these videos ! But I was wondering, if those elongated stars are round again, are they on the exact position in the image ?
Well. I will have to test it more but this function removes elongated stars by replacing them with fitting round drawings of stars. That alone seems a bit questionable, but it also heavily depends on the correct star recognition. And it often recognizes doubles as one star, killing your data. For me, this is not the way. I like pretty pictures but the stars should be correct.
Great video and your instructions are easy to follow. However, I was trying to apply this to an image of M13 and my starless image of M13 has a blur automatically applied to what remains of M13 and when reconstituted with the star mask, the center of M13 is blurry and looks horrible. Do you know of a technique that can work on star clusters like M13, M4 and others?
Thank you! I wouldn't recommend using Starnet to remove the stars from a cluster, and that may be why you're seeing the results that you are. If your stars a elongated in a cluster, I don't have or know of a way to correct that.
Thanks for the reply Rich. I didn't explain myself very well. The shot is a wide field shot with a AT72 scope and a Canon 77D. I only cropped it just enough to remove the stacking artifacts, so there is a large star field surround M13 and my problem is with the stars way outside the cluster.
It's ran against your stack. You can see I selected the result.fit file here ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VNAcOcpubgQ.html which is my stack.
hi there i was just wondering if there is a way to apply this to the sequence? or do i need to fix each frame and resave the lights befor stacking... currently my stars are to obong where siril is rejecting all but 7 of 90 frames
I don't think so, but maybe this will help with your issue. This link will take you to the part of my tips/trick video that shows a possible solution. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BOVLBVvHTdo.html
@@DeepSpaceAstro I’m assuming Deconvolution first because the un-deconvoluted star becomes the template for deconvoluting the whole image including nebula contours. But that’s just my guess. Must test.
Oddest thing, I was (admittedly rushing) to process an NGC6888. Stacked image (r_pp_*stacked.fit) and when I ran Resynthesize all, the whole nebula disappeared. I've used Resynthesize before on images pre-Starnet removal (I think!)... did I do something stupid, skip a step or something? Reason I was doing this was same logic as Deconvolution... reshape before Starnet to avoid artifacts around the stars if I were to reshape them after Starnet and then not have a good fit when the stars come back in.
Yep, because they're synthetic. You can add some blur using the gauss command in the console. Something like gauss 1.2. Keep in mind there's no undo for commands issued at the prompt.
Dam....great job...That simple short tutorial unloaded a lot of editing power I have on a backlog of data. Results are comparable to pixinsight. But cheaper.
@@DeepSpaceAstro I am on version 1.2 beta. What is your workflow regarding the stretches? Do you do all your stretching in star processing for data that has some star issues? Or do you do your stretching then go to star processing?
Very interesting video Rich... anyway, as always. I'm thinking about how to use this feature in case of some shots, during the night sequence are bad (such as an example a gust of wind) do you think it'll be possible to recover these shots intead to reject all, do you think it'll possible and then join to the good ones? One more thing regards to the color of the stars after the synthesis stars process, in your video seem that alla stars are white, I'm wrong? Ciao Roberto
If you're talking about bad individual exposures that are rejected during registration, you can try the setfindstar command. I show how to do that here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BOVLBVvHTdo.html Yes my stars are white but I beleive that is because I use my L-Enhance filter when shooting. I don't remember for sure since I shot those images last year.
I followed these steps for the saturated stars (ie, not script, just menu) and with D-PSF I got one maroon star. I next ran Desaturate Stars but the maroon stayed even after clearing D-PSF tool, then re-selecting, getting maroon again, and even running Desaturate again. On a zoom, I can see the star changing shape on each iteration. Is that just a seriously sick star, keep iterating?
User error. I was going back to old folders and was starting with .tifs that were pre-stretched output for PS. But if I may… would you Deconvolution first before the Desaturation if wanting to deconvolute (for benefit across the image)?
So glad I had Google recommend your Site ! I'm an old SiriL User and I've been a little wary of the new version . Now I can watch your Vids and learn a few things . Nicely done . Thanks a million . Subscribed of course . /SRK
Hey Rich, I heard in one of your videos that you have a M50 MK2, right? Does it support the ASIair plus? I also have a M50 2 and I was thinking about to buy an ASIair, but how the M50 hasn't the intervalometer port. I'm not sure if it can work integrated.
I don't think you can use the M50 with the ASIair for the reason you stated, but I could be wrong. You can use a Bluetooth intervalometer app to control the camera though. I just don't think there's a way to tie the two together. If you haven't seen it, I have a video for the intervalometer app and M50.
@@DeepSpaceAstro I was researching about this topic and I found out the ASIair controls the camera through the USB port. It contains a shutter port, but it is not necessary. I also saw in their website that it is compatible with the M6 MK 2. This camera has the same chip as M50 MK 2. I believe it can maybe work. 🤔
Another great Siril tutorial, thanks Rich! Do you know if it's possible to use this as part of a script so it can 'fix' elongated stars prior to registration? Registration won't include the light frames if the stars are too 'out of shape', unless there's a way around this? Clear skies!
EDIT: Try this to see if it gets the images registered. At the Siril command line (bottom right corner) type without the quotes "setfindstar -roundness=0.1" then run the OSC-Preprocessing script. If that gets things going, then open the result file and run the Fix Misshapen Stars script and see what happens. It may not be 100% though. Let me know. I've been looking at this, and you have my wheels turning. lol I'm "kinda" close to a resolution I think, but no promises. In the mean time shoot me an email. Address is in the About tab on my page.
There never were any logs written, just what's in the console screen. I think you can start Siril from a command line and have it write out the console screen. Is that what you're talking about?
I am so excited for these new features. I hate processing stars and these features look like they will solve a lot of my problems. But I am having an issue with my scope with chromatic aberration on my stars. My images don't have the colours aligned correctly and it causes noticeable issues causing colour bleed on the stars where one side will be tinged blue and the other green or reddish dependant on the stars colour. I believe it's caused by a combination of the scope being an achromatic doublett and that I may not have my back spacing dialled in perfectly. I'm trying to resolve the second cause but its never going to be perfect due to the achromatic optics. I shoot in broadband using a Baader moon and skyglow filter. I mainly chose it because I loved the way it kept natural star colour. But I can't really show it off because of the issues I'm having. Do you know if these new features added could fix this? Or is the only way to fix it post shooting going to be to stack the rgb separately to align them correctly?
Not sure how the resynthesis would handle it. They say the star colors won't be lost, but maybe the synthetic stars will have less of the tinged colors. Give it a shot. It runs relatively quickly. Then blend them back in with the recomposition tool. Maybe keep the star mask stretch light will help as well.
@@DeepSpaceAstro Tried it with a starlayer from StarXterminator and it works. First converted the tiff to a fits. I have mixed feelings about the result. Elongated stars are completely gone and are nice and round. But when I add in the nebula the final result looks ’fake’ to me. Maybe it needs some finetuning.
Yeah I'd agree, it's not perfect, but if you can't reshoot it's probably the only option. A couple of others here said they got good results in Photoshop using the "Less Crunchy More Fuzzy" action from Astronomy Tools. Give that a shot if you have it.
Awesome Rich. I must give this a try. There are some options in Photoshop that are effective in doing this but this is incredible. As always thanks for sharing 🤝
@@DeepSpaceAstro I’ve just tried this out today on an image of M31 taken last year. It was ‘incredible’. I actually took the starless image and the star mask out of Siril having saved them as .tif files and imported them into Photoshop. The stars looked a little unnatural but when I used ‘less crunchy more fuzzy’ in the Astronomy Tools Action Set (Pro Digital Software) they were transformed 👍
