The Best Free Astro Software just got even BETTER
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- Опубликовано: 3 окт 2024
- Siril 1.2.0-beta1 was just released. Let's check it out! siril.org
== Notes / Corrections ==
-On Windows only, there is currently a bug with Starnet - see the easy workaround near the top of the release notes: siril.org/down...
-With the GHS tool, try picking a symmetry point more towards the right side of the histogram bump after initial stretch as lots of interesting stuff is usually over there to bring out. See the GHS tutorial below for more details.
-I misspoke in the small section about PCC at the end. You can still platesolve inside PCC, it's just that now you can also platesolve separately with the new process (or even in a different program), and PCC will pick that up from the metadata in the FITS header
== Resources ==
Blog post on the 1.2.0-beta1 release: siril.org/down...
GHS Tutorial: siril.org/tuto...
Starnet Downloads: www.starnetast...
Starnet Installation (including MacOS commands): siril.readthed...
New Documentation: siril.readthed...
ANSVR (local astrometry.net for Windows): adgsoftware.co...
== Patreon ==
I'm on patreon! Join me and over 800 in the Nebula Photos Community: / nebulaphotos - starts at just $1/month.
![BabyChiefDoit - Too Slow (feat. STAR BANDZ) [Official Music Video]](http://i.ytimg.com/vi/zayaxws7RPg/mqdefault.jpg)
Omg Starnet being built in, ON TOP of creating a separate star layer at the same time, is Christmas to my ears.
mine won't work with Starnet says it cant find it
Excellent. I like the ease of Siril. Now it is even better. As you mentioned at the end, you didn't perform some steps like Crop, Color Cal, Background Extraction, Remove Green Noise. Perhaps a Siril Workflow cheat sheet for us entry level guys would help, like a one or two pager. Thanks
I think the workflow is the "canonical" one that Nico does in the other tutorial, like this one of the Dying Star "ruclips.net/video/flnRjxnXcTI/видео.html" or this one of the Andromeda Galaxy "ruclips.net/video/ambUmZLOeSs/видео.html". These have helped me a lot!
Hats off.Your a great communicator. I think you may of been the first astro content creator that i learnt something from,so its quite impressive that m still learning a couple more years into this "hobby" I hate that word..
Siril saved this hobby for me in the beginning and now it's looking like I might be able to use it more often than PI. Excellent and thanks for the demo!
Same. I started with StarTools which was an exercise in frustration. Moved to Siril which I loved but didn't do everything I wanted and settled on PI. But to have a good competing platform is amazing.
Very clear and no BS tutorial/demo. Never tried Siril but will certainly do so. I like that the UI has the look and feel of RawTherapee but that may just be me.
SIRIL is worth it for the GHS alone! That's incredible!
Great discussion, and big big help for newbies like me to astro image processing.
Camera's are generally more sensitive to green, the red and blue need to be boosted to get a basic whitebalance, when only the green channel is over exposed/clipped the boost in the red and blue channel produces a magenta-ish color, this isn't always noticeable because the highlights generally get compressed but if you apply an algorithm that boosts color in the highlights then the magenta-ish color also gets boosted. Maybe the siril dev's could implement highlight reconstruction like in darktable, it's open source and very effective in fixing over exposed point light sources.
do a negative transformation remove green noise then negative transformation that will remove the magenta-ish color
This looks very interesting, time to revisit Siril I guess. thanks Nico!!
Siril is awesome! Thanks for the help in learning how to utilize it better
Great video, Nico. Thanks for going over some of these cool updates to the new Siril beta.
Sweet Video Nico,Ive Heard A Cpl Others Talk About This Program,I Just May Check It Out,Thank You,Clear Skies,and Beautiful Image🙏🏼❤️🙏🏼
I've been using this software on Linux for a while now, and I can confirm that it works amazingly well! It's great to see updates that make it even better. Thanks for sharing this video! \m/
Wow - thanks Nick. I watched other videos about the GHS and never could manage to get it to preform the way I knew it could. Following your walk through changed that. I just reprocessed data from M92. I was trying to not blow out the core, and had even tried two stretches and a layer/blend in GIMP (kind of worked) - but working through it while watching helped tremendously. I am now Team GHS. :)
Excellent!
I'm loving GHS, Starnet integration and the much-improved deconvolution tool. The only letdown for me is the noise reduction - it just does not work well at all on colour images. (To be fair, the developers acknowledge that in their documentation). If they can solve that and maybe add some masking options in the future, then Siril will have everything I need.
Thanx Nico for this info. Without the Video, I would not have known of the Starnet tool for Siril.
Thanks a lot Nico..this is really something to look forward to
Plus 1 for the new version of Siril! Awesome.
Nico, thank you so much for doing these open source updates! I really like siril, but like you I would only end up using a couple of features and end up bashing my head against the keyboard tinkering in gimp, or just saying screw it and applying an autostretch. This new GHS model looks killer, and I have a feeling this weekend is gonna disappear in re-edits.
I've had Siril for a long time and didn't realize the ease of use this is a game changer for me and post, Thanks Nico for your contributions to astrophotography, You're a pioneer in this field.
Always love seeing the love for Siril, this will hopefully save me some time trying to explain how I use it. Thanks again!
What they done to Siril is amazing. Sadly I haven't any RAW, but even from JPG I could take so much more data. Now I have to make new images😅😅
Always love a good Siril Vid. Good work..
Very nice, been a while since i update my Siril, it have worked very good for so long(Not stable in the past) so i just left it alone :D Very tempting to update now tho.
Hello Nick. Greetings from Toronto. I just subscribed to your channel. Thank you for this video. My processing has always been very poor. With this software, I think I can improve a bit the data I have captured during the pandemic years. All the best and clear skies!
Much thanks for your great and detailed report about that excellent Siril tool.👍🏼✨💫
Concerning the pink stars, for what I come for my researches, it's related to a mismatch between bit-rate of the source image files and the resulting stacked image. For example, in my case, I do astrophoto with a Nikon camera which provides 14 bits raw files, but PixInsight's and Siril's stacked images are 16 or 32 bits, By consequences, we get a saturated 14 bits color translated into a soft non-saturated 16/32 bits, which results into that pink.
Very interesting. Any way to fix it?
@@shekibobo Never really found a real fix, but my processing steps allowed me to get around the issue.
I extract the stars in a separated image while still being in linear mode, and I stretch them just over the point where the pink turn white, but they remains under-stretched compared to the seep-sky image, so they remain smalls. This way has also the benefits to avoid star reduction because under-stretched stars are not as large as the full-stretched ones, so no need to reduce them over :)
Thank you Nico for another great video. Siril is awesome and your videos are top notch.
the reason for the pink star cores is the color calibration. It turns white into (bright) pink. With conventional stretching this would be no problem, since the star core gets stretch until its burned out again.
Just discovered this software, its amazing. im able to remove Coma aberrations, this opens the door for a lot of great fast lenses to become excellent astro lenses. One of the best affordable fast 24mm lenses around is a used Nikkor 24mm f1.4g. It would make an awesome milky way lens but there is some coma aberrations in the corners. That was never a dealbreaker for me on milky way shots since the stars are
Small, but many people don’t like it. Now you can fix it. I wonder how many other great fast lenses are out there which people have previously overlooked.
Thanks Nico for this step by step video. It was a game changer for me. I use an uncooled camera (ASI 585mc) but couldn’t believe the final images I was getting after going through your video and following the different techniques. 🙌 I’ve since re-processed previously stacked images and cannot believe how good they’re coming out.
Thanks to Nico for this excellent tutorial.
Great tutorial! Nico after your ranking of stacking software, I'd like to see you at work with another free software, astap, which if I remember correctly had a rating of 9 (very high). Explained by you I'm sure it will be very easy to understand like everything else! Thanks for what you do.
Great job！Nico
I love your tutorial and subscribe. 🤗
Thanks for that. Having used DSS and Photoshop on my first DSOs (Lagoon and Trifid Nebulae) and got a pretty poor result, I restacked and reprocessed using Siril and got a much better one in a fraction of the time, mainly by following along with your tutorial. Couldn't get the platesolve to work for some reason though.
Thank you for a fantastic tutorial. It is extremely helpful. I'll have to make the jump from the asi software and have a little challenge to myself
Great tips, Nico!
Thanks for the tutorial, very helpful - as are the tutorials in Siril itself! But following you step by step is just great. The video also shows how good you are at collecting the data, a good camera, a good lens, good tracking and an experienced person behind it just shows immediately! What a beautiful nebula!
Great video Nico!!
U brought me in to use siril as first astro processing software
Great video as usuaI. like the down to earth kind of vibe. :)
I have trouble getting starnet to work on windows even if i start siril through cmd. guess ill have to wait a couple of days and se what people come up with.
Brilliant video tutorial this software has come a long way. I really enjoyed playing around with your data files
Made it a joy to use as I knew the data was good and I could get good results.
Do you have any Videos that have OSC data?
I started out with a canon camera and a few budget lenses inspired by the video you did with Trevor on the Witch head nebula
Keep up the great work 👍👍👍
Thanks!
Thanks for everything you do, keep up the awesome work
Great tips for how to use GHT. I was playing with the developer version, for awhile but kept going back to v1.06 - your video prompted me to try this new beta, what a difference! First glance two things I checked on - they must have finally recompiled with current Libraw because Siril now supports Olympus/OMDS OM-1 raw files that it never did (YAY!) I'd guess there may be some other newer raw support in there, too. And it looks like they fixed the swap storage problem (at least on MacOS) so it reads the actual free disk space instead of some crazy low number that would cause it to fail processing for lack of space, when there was plenty left. Just keeps getting better!
If you run each binary from the terminal beforehand, then macOS security will ask you if you allow the binary to run, so it is a good practice to first run the binaries from the terminal to then allow them to run on macOS System Settings, and then set the binaries on Siril, so you'll not have any security warning issues.
I might be wrong, SiRil 1.2.1 photometric calibration includes a search bar for RA and Dec for a given object. I searched Pleiades, it loaded the info, plate solved, and did the calibration.
You are right. I misinterpreted something I read about changes to photometric color calibration in 1.2
Finally got starnett to open in siril❤
Thanks
Superb video
Hey, great video as usual. Still waiting for a video on how to process JWST data with only siril and photoshop. It will be very helpful. And thanks again, I'm learning a lot from your videos.
I'm not sure if they changed something in the mean time (final 1.2 version) but you don't have to go to Plate solving first - all is done within Photometric CC.
I would LOVE to see you make a 'quick and dirty' guide to siril for people that have never processed before. I'm new to this (just bought a seestar s50) and I am scared!
Nico, sounds like you are REALLY enthusiastic about this update. Playing with it a bit. Of course, switching between Pixinsight and Siril and then using Photoshop can make you crazy……
You should really be proud of the videos you share and the way you make them. They are a real treasure for completely noobs like me. Any ideas why my stacked photos (taken with my Canon R6) have the RGB not aligned? I've checked your analysis on the stackers, and I've tried in ASTAP and DSS (here I have align RGB selected). Same results. I'm trying to get my first "final' picture and no luck. All horrible 😢
Sounds like wrong debayer setting. Email me your file, and I can take a look: nicocarver at gmail dot com
Great channel. Love your presentation style. Thinking about becoming a patreon. I’m curious if you do much related to wide field Astro photography (Milky Way). Thanks a keep up the fantastic work.
I have a few videos about wide field: milky way, star trails, wide angle lens shootouts, but I'd say my specialty is deep sky. My favorite for landscape astro on youtube is Alyn Wallace
Excellent video as always!!!!!!!!! But, Siril has gotten so complicated for the "average hobbyist" it's losing some appeal to me. And it's my default processing SW... GHS seems overkill for this "old timer" My family and friends wouldn't know the difference! What happened to KISS? LOL I would like to see a KISS version of using SIRIL's processing scripts for a basic "10 minute" edit. Thanks for efforts...........................
You don't have to use GHS if you don't want to. All the other stretch options are still there. But it's worth taking the time to learn - it can get you good results quicker once you know how to use it.
Yes, Siril is a pain in the A**, i will not use it. Affinity Photo 2 isn't bad, DSS is usable, i've to look for APP and PI.
Hi. Enjoy your videos. Can u please tell me the star edit app u use with android. I can't find your video u posted about it a few months ago. Thanks.
Thank you, this was really informative. Can you use Siril for wide-angle milky way landscape shots?
11：59 is it because u did the calibration and it decrease the green channel?
[Please note, I'm writing this comment with Sarcastic Mode engaged and a wry smile on my face.]
Oh, great: more stuff I can't afford! Yes, the software's free - whoopee - but running it effectively is another matter. So now I can't afford optics, a tube, a mount, or a camera; I also can't afford the monster computer needed to process the images I can't afford to take. (I'm still using a single core desktop PC from 2005 running Windows XP.)
I can't afford dark skies, either, because that'd mean buying a car to drive umpteen miles out onto the Yorkshire moors [I'm in the cold, wet north of England and can only afford to run a bicycle these days], so what are my stargazing options?
Well, week after week of back garden cloud-dodging misery is too frustrating for words, so let's hear it for vicarious astronomy. Yay. 🙂 It's the best kind. It involves watching videos from guys like Nico on RUclips. No cost, no discomfort, no hassle. Just brew some tea, open a packet of yummy choccy biccies, sit back and relax...
The images are always perfect when someone else is taking the time and trouble to create them.😁
Sir, would you consider a video on the 'best' and 'easiest' free/paid-for software (packages) to control telescope mounts? Thank you.
I just bought a Canon EOS Rebel T7 because of one of your videos. I really want to get into Astrophotography. Do I need to learn the basics of photography first? I found a udemy course and enrolled, but it's gigantic. I want to get taking pictures as quickly as I can so I can learn about all of the astrophotography tools because this hobby seems like it has a steep learning curve. Any advice for a complete beginner? I watched your video where you talked about just using a camera and a lens and a tripod. So I bought all of those things. I am just wondering what I should focus on next.
Thank you! Great demo/tutorial! I wonder how it would work on the Dolphin nebula (SH2-308), which I have a lot of difficulty with in stretching its data.
Would you consider a video showing how to make a false color image using duo band filter or tri band filter. like a synthetic hubble pallette using siril to extract the ha and oiii and then combining them.then using photoshop to process the final image. There is no good tutorials on this subject at all. Thanks for the consideration!
Excellent video but you never did starless stretching first as you said you will
Hi, I'm a newbie to Siril and find the manual that comes with it a bit 'challenging' - I did say I was a Newbie. Is there a video from scratch to show us newbie's what to do please?
All the best.
I have seen those red stars also in pixinsight. There it was because the recombination of the different channels was done with files in their lineair state instead of the non lineair state of the subs. Might be related?
The only problem I have with siril is that it requires a lot of space to run and it's something that I cannot handle right now :')
Use external hard drive
How much space are we talking about here?
@@marcellnagy5771 Once I buy one, I'll be using siril for sure. but for now, I'm using ASTAP. DSS can't process RAF files fast. It takes more than an hour to just register 30 Dark frames.
@@possiblepilotdeviation5791 If I capture 30-60 minutes of lights, it takes nearly 50-60GB. And the processing time is also way longer.
Way longer? Compared to what software? That surprises me because siril is by far the fastest one for me. Also don't use scripts if you have issues with space (it's easier to manage the files without them)
Excellent video. Can't access Siril website at the moment. Maintenance or something else?
Their website host is having some technical problems. They aren't sure when it will be fixed, but are working on it. I'd suggest to try again in a couple days.
Thank you for this information.
Hi Nico,
i love Siril a lot, been using it for a long time, but using an old 2012 Mac Pro (really powerful beast) for some processes i switched to PixInsight as starnet++ which i can't use with this mac, no tensorflow with processors. Just a request, which I never managed to solve with Siril, how can I stack multiple nights sessions?
Thank you very much and congratulations for your channel
Hi Luca, you can either pre-process everything manually with the tabs to the right to do multi-night sessions or get the add-on 'Sirilic' which is an additional download/UI that can handle multi-night but using the scripts. I still have to do a video about Sirilic at some point.
Thanks Nico for the informative tutorial. I have tried the noise reduction feature but so far I don't seen any changes in the image. Not sure what I'm doing wrong. Have you had a chance to test this?
Hi Nico thanks for the great content. I am running into issues with Starnet/Siril integration on M1 Mac. Any help would be much appreciated. Thanks.
Check out this part of my video on Starnet for installing the new M1 optimized version of Starnet: ruclips.net/video/gyOa8eNIVlk/видео.html After it's installed and permissions are okay, you should be able to just point to the folder in the preferences in Siril and will have ultra-fast Starnet in Siril! Let me know what issues you are running into. If you need to send me screenshots, you can email them to: nicocarver at gmail dot com
Hi Nico Thank you that worked and yeah super fast. 🚀🤩
when I launch it I just get a command prompt window, no interface.
Hello Nico thank you for the amazing tutorial ☺️. I have a question about the blending mode of the stars and starless layers. You said in the last video you uploaded that it's possible to choose the blending mode thanks to pixelmath (you also showed the formula). But I can't understand in which part of the process should be done. Thank you again for the effort you put in your video❤️
This new Star Recomposition tool in Siril shown in this video basically replaces the need to do this, but if you still want to use pixelmath to blend: 1. stretch (not a huge stretch, just a little) 2. Use Starnet++ to make a starless version 3. Stretch the starless version more 4. open pixelmath and use the formula to combine the stars and starless version. 5. continue editing with the combined version
Thank you 🤩🤩
Hello Nico. Greetings from Toronto. I just started using Siril, migrating from DSS. I would like to ask you about the stacking process. I am doing manual stacking instead using the scripts. I captured about 165 short subs of 60 seconds with my CCD cmos camera. Siril only stacked 32 of 165. Would you please let me know what is it that I am doing wrong? Your help is greatly appreciated. Clear skies!
Are you using the defaults when registering/stacking? It is successfully registering all 165 and it's only when you get to stacking that it's rejecting that many? Have you looked through the subs using the 'frame list' in the sequence tab to see if they look normal or have issues?
Thanks for demonstrating some of the new features in the updated version of Siril, Nico. Looks like some great improvements! So, unlike PixInsight, Siril is unable to read the embedded plate solving data in FITS files, is that right? (If I'm remembering correctly, the only time you have to use Image Solver in PI is when you're NOT using a FITS file. I could be wrong.) So, is there anything in Siril that you would recommend using in place of the processes in PixInsight, i.e., anything that's easier, more intuitive, or performs better? Thanks again for the update!
I have found that, occasionally, I have to use Image Solver on a fits file. Once I do that, Spectrophotometric Calibration works.
@@jackbernstein3029 Hmmm...that's interesting. Thanks for the reply, Jack. Wonder why it doesn't work on certain FITS files?
I've followed your starnet instructions to the letter but execute is still greyed out (windows). It seems that a whole slew of older computers can't take Starnet++ so can't follow your lead. I think you ought to mention this, at least.
Thank you. This was a a great video. Can you mention which MacOS you are using? I know Siri had some earlier problems with Ventura.
I'm on MacOS Monterey. There is a partial fix for Ventura according to the Siril website (siril.org/2022/12/bug-fix-for-macos-ventura-users/). I haven't personally tried it since I'm holding back from updating to Ventura since I use a number of the open source applications listed that rely on GTK3 to work.
Ahh. Sonoma is the standard version of macOS now. I wonder if Siril works on Sonoma?
@@shubinternet Yes Siril 1.2.0 and 1.2.1 work on Sonoma.
Maybe someone can help me. When I start Siril the window appears high up on my screen so I can't move the window. Half of the logo can be seen. I can't edit the link on the desktop either. How can I reset the window position? Thanks
Hey nico
Dont mean to pressure you or anything, just wondering when your photo critique will come out
Siril 1.2.0-beta1 does not work under GUI for manual stacking on Windows platform. I had to use the command line to execute the process.
I am a windows user. I installed the command line version of Starnet and pointed Sirl to it. The Starnet star removal window came up with a blue Execute box. I checkboxed "Recompose stars on completion" in addition to the "Generate star mask" that was already check. Siril crashed when I clicked Execute. This happened again three more times. If I do not check that Recompose box, it doesn't crash. However, the resulting file looks identical to what I had, with stars intact. Has anyone had this experience?
I installed Siril today and Recompose just crashes Siril, while using Starnet without recompose ticked just results in a single TIF of your current image... and nothing else happens.
Running Starnet directly in CLI gives me two TIFs, but nasty halos in the starless image :/
Hi Fred, unfortunately, there seems to be a bug in the Windows build of this new beta version of Siril. There is a workaround posted towards the top of this post: siril.org/download/2023-02-24-siril-1.2.0-beta1/ that you may want to try out.
For the halos issue, Starnet shouldn’t be creating any halos that weren’t already in your data, but it can make them appear more visible since the stars are removed. Once you add the stars back in they shouldn’t be any more noticeable than they were before, and I actually think they can be much easier to minimize without the stars if you are open to using some tools like clone stamp in photoshop or gimp. Cheers, Nico
@@NebulaPhotos I'll take a look at that link. Thanks!
@@NebulaPhotos Yup, that link has sorted me out. Thanks!
I downloaded it within the first 6 seconds of the vid
Hey Nico, which one is good for processing? Laptop or a desktop? using SiriL or Photoshop or PixInsight. My old windows i3 laptop chokes and is slow. Want to replace and buy one depending on your suggestion. Thanks in anticipation
Updating it now :)
Hi, can you do a video about the influence of different lenghts of shutter speeds to the final image (same total integration time) please? :-D
I have this one: ruclips.net/video/mYucAuUrdTs/видео.html (1 second vs. 30 second shutter speed, but same total integration) Let me know if you have something else in mind. I am not as interested in like 1 minute vs. 5 minutes because any differences will be so subtle it won't make a good youtube video I fear.
@@NebulaPhotos Hi, thanks for the fast answer. Yes, I meant like 30 seconds - 2 minutes - 5 minutes tracked... But if you say that doesn't really matter I've got my answer and will continue with my Samyang 135mm and 30 sec exposures. And thank you for the great video, I just recently started using Siril and I love it.
Is the starnetastro website down. Does anyone have the file that they could share?
Is it 'better' to increase ISO or time to increase EV normally, and what might some exceptions be? I have a Canon 7DII so ISO up to 6400?
Without a tracker: try high ISO, 3200 or 6400 and time is based on how long until stars trail.
With a tracker: set ISO at a good balance point of read noise and dynamic range, usually 1600 for Canon. Then increase time until histogram in playback mode is 1/3 over from left.
I`ve tried to 1.2 version, however I can`t have colors on my pic lol . Only black and white :)
A couple things to try:
1. Make sure you are on the RGB tab at the top
2. Is it giving any kind of message about 'debayer' - in the settings you can look up how it's debayering the files, sometimes you may have to look up the bayer pattern and set that manually.
If it helps to send me some screenshots: nicocarver at gmail dot com
I downloaded the latest version of Siril but I am unable to try it out. Everytime I run it, it opens and then the main suddenly disappears. The only thing that remains is the writing “Siril” in the upper left corner beside the Apple.
Is there anyone else with my same problem?
Thx,
Fabrizio
How does one know when you are done? It seems so subjective.
Maybe I have missed it in my searching, I use an unmodified DSLR and I will use an Ha filter during full moons. Is there any tutorials that cover stacking Ha data in SIRIL and adding the result to DSLR data in SIRIL, or simply combining Ha and DSLR OSC data in SIRIL?
Yes, you can add Ha data to the RGB data extracted from an OSC camera, using SIRIL.
Hi Nico, do you know of any problems in using Starnet with MAC M2 chip running Sonoma 14.5, as I cannot get it to accept Starnet as a directory in the Preferences section, where it is supposed to point to the directory where the downloaded Starnet is ? thanks in advance. Kenneth
Hi Kenneth, I may have misspoke in the video. From the preferences, after you click the folder icon to point to starnet: navigate to the Starnet directory and actually click on the starnet2 executable, and then click the 'Open' button. If that doesn't work, send me an email: nicocarver at gmail dot com
Great vid!! Any advice out there regarding Ubuntu. and integration of Starnet++ with Siril? The preference tab asks for the location of Starnet++ and valid gnuplot installation directory. The Starnett++ is portion is the same as the above vid but the gnuplot part is not included. Using the whereis command I found gnuplot in three locations but cannot get the Starnet++ to work in Siril. The Starnet++ does work in its own directory. Thanks again
The gnuplot directory location is not related to starnet (it's a seperate external library you can install for some scientific plotting functions in siril). What is the error message (if any) when starnet doesn't work in siril?
The Starnet does not light up white in the drop down menu.
It is running now. Thanks.
@@damainsmith1084 What did the trick?
@@NebulaPhotos I think just user error. You have to pull up a photo in order for the menu to highlight. Thanks again. This is so cool. I'm chatting with a celebrity.
the starnet website is down for some reason
So if I’m understanding correctly, Siril combines something like deep sky stacker and photoshop into your one stop shop to do it all?
Yes, it has pre-processing (calibration, alignment, and stacking) like Deep Sky Stacker and post-processing (stretching, color calibration, etc.) like Photoshop.
when I enter the command prompts, it says "'chmod' is not recognized as an internal or external command, operable program or batch file".
Which macOS? Could you write out exactly what you are writing? Or send me a screenshot: nicocarver at gmail dot com
I'm new to astrophotography and I'm wondering if this software is a replacement for pixinsight? Not keen on paying the license fee for it.
Yes, it's an alternative. I wouldn't call it a replacement as it doesn't do everything PixInsight does. But if you are new, Siril will give you plenty of options to get started. The things that PixInsight can do that Siril can't are not particularly important for a beginner in my opinion.
I am starting year 3 in this hobby, and the only non-open source software I use is topaz denoise (although siril now has a denoiser so I might not even use that anymore lol) The point is, yes Pixinsight is the king of astro processing, it's well worth the money if you can afford it. But this open source stuff is getting pretty darn good, and you can produce very respectable images with it. Just remember to kick the guys that wrote it some cash every now and then. They do good work.