PixInsite Confession

Tony GondolaJeffrey Kieftandrea tasselliRick KrejciCyril Richard
50 replies1.7k views
Tony Gondola avatar

Some of you my know that I’ve been very much a Siril user and a big believer in free software. With the addition of the great tools in SASpro and scripting in Siril I felt like I had everything I might possibly need to create good images and as long as I was shooting OSC, that was pretty much the case. Once I made the switch to mono though, everything changed. Because I was using Siril as my main processing program I had to parse out all the different files into different processing folders and treating each color as a different project. Those of you who use Siril will know what I’m talking about. It is a lot of work and prone to error if you’re not paying attention. So, out of curiosity, I evaluated PI again and this time, it was a revelation. Let me layout why in the hopes that others like me might at least have a better idea of why people like PI so much.

The first important thing to realize is that PI is an astrophotography work-station, not just a straight line processing program. It’s designed from the ground up to handle lots of files and complicated workflows. The first time I just dumped all my files from multiple sessions into a single folder and told the weighted batch preprocessor to start, I was amazed to see all my data, sorted, calibrated, cropped, aligned, stacked and ready to go, I couldn’t stop smiling. What would have taken me an afternoon of endless clicking was done in half an hour.

The other impressive thing is the efficiency and elegance of the interface. I know a lot is made of PI being super hard to figure out and and very unfriendly but I found it was just the opposite. Sure, there are some basic things to learn but once you do, you’ll see the logic in it. If you get stumped, everything has a tool tip and deeper questions are easily answered with a Google query. The other neat trick is there are four screens or workspaces. You can iconize your most used processes and save the whole arrangement in the middle of your workflow, images and all for instant recall later.

The last thing I’ll mention is that the tools are very refined. Even the basic background extraction tool is anything but basic. If you’re wondering about BlurX, all I can say is, just get it. I have tried Cosmic Clarity, Syqon and all the other tools out there and nothing works as well for reducing stars and bringing out detail. Period, full-stop. I’ve struggled with them all and it’s not even close.

BlurX aside, the bottom line is, if you shoot OSC and keep a fairy simple workflow then you can certainly live without PI. We have great developers out there cranking out amazing free tools. That said, if you shoot mono or OSC with complicated workflows, PI will improve the speed and quality of your work.

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Habib Sekha avatar

Tony Gondola · Mar 13, 2026 at 10:09 PM

The other neat trick is there are four screens or workspaces

You can create many more workspaces if required.

You might or might not have discovered that you can give each workspace its own name.

Have lots of fun and success with PI, Tony!

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Tony Gondola avatar

Habib Sekha · Mar 14, 2026, 01:50 AM

Tony Gondola · Mar 13, 2026 at 10:09 PM

The other neat trick is there are four screens or workspaces

You can create many more workspaces if required.

You might or might not have discovered that you can give each workspace its own name.

Have lots of fun and success with PI, Tony!

Thanks for the tips. I didn’t know any of that!

Fabrice Lamidey avatar

It is incomprehensible to me that Siril does not have a fully automated, foolproof preprocessing module. When you are into heavy multi nights multifilter imaging, WBPP will do in 10 clicks what takes over 50 or 80 in Siril, if you're lucky to know what you're doing…

Tony Gondola avatar

Yup, it can be done but as you know, it’s very labor intensive.

Rajat Kumar avatar

I completely agree. I use Astro-Pixel Processor for stacking and SIRIL for pre-processing and stretching. SIRIL, on its own, is very painful for stacking mono data or even multiple nights of OSC data. There is SIRILIC implementation, but it’s not as intuitive.

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Albut avatar

Tony Gondola · Mar 13, 2026 at 10:09 PM

Some of you my know that I’ve been very much a Siril user and a big believer in free software. With the addition of the great tools in SASpro and scripting in Siril I felt like I had everything I might possibly need to create good images and as long as I was shooting OSC, that was pretty much the case. Once I made the switch to mono though, everything changed. Because I was using Siril as my main processing program I had to parse out all the different files into different processing folders and treating each color as a different project. Those of you who use Siril will know what I’m talking about. It is a lot of work and prone to error if you’re not paying attention. So, out of curiosity, I evaluated PI again and this time, it was a revelation. Let me layout why in the hopes that others like me might at least have a better idea of why people like PI so much.

The first important thing to realize is that PI is an astrophotography work-station, not just a straight line processing program. It’s designed from the ground up to handle lots of files and complicated workflows. The first time I just dumped all my files from multiple sessions into a single folder and told the weighted batch preprocessor to start, I was amazed to see all my data, sorted, calibrated, cropped, aligned, stacked and ready to go, I couldn’t stop smiling. What would have taken me an afternoon of endless clicking was done in half an hour.

The other impressive thing is the efficiency and elegance of the interface. I know a lot is made of PI being super hard to figure out and and very unfriendly but I found it was just the opposite. Sure, there are some basic things to learn but once you do, you’ll see the logic in it. If you get stumped, everything has a tool tip and deeper questions are easily answered with a Google query. The other neat trick is there are four screens or workspaces. You can iconize your most used processes and save the whole arrangement in the middle of your workflow, images and all for instant recall later.

The last thing I’ll mention is that the tools are very refined. Even the basic background extraction tool is anything but basic. If you’re wondering about BlurX, all I can say is, just get it. I have tried Cosmic Clarity, Syqon and all the other tools out there and nothing works as well for reducing stars and bringing out detail. Period, full-stop. I’ve struggled with them all and it’s not even close.

BlurX aside, the bottom line is, if you shoot OSC and keep a fairy simple workflow then you can certainly live without PI. We have great developers out there cranking out amazing free tools. That said, if you shoot mono or OSC with complicated workflows, PI will improve the speed and quality of your work.

This year a number of sophisticated tools/scripts have been added to which definitely makes it every bit as good and easier to use. PI with its plugins would cost more that I paid for my smart telescope, SIRIL is free.

Eric Gagne avatar

Wait until you need Grouping Keywords and figure out how powerful they can be for stacking images from multiple sessions at different temperatures or for mosaics. That will be another revelation 😀

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andrea tasselli avatar
WBPP is NOT the reason for buying PI. Ever.
Eric Gagne avatar

andrea tasselli · Mar 14, 2026 at 01:39 PM

WBPP is NOT the reason for buying PI. Ever.

Obviously not for you Andrea but it could be for others.

Erny Epley avatar

I wholeheartedly agree with this post. I was hesitant to jump into PI at first as well- mainly because of the price and the reputation of its steep learning curve.

Without going into painful detail, all I can really say is that the program -along with the RC plugins- has proven to be worth every penny for me. Yes, the learning curve can be real at times, but honestly, when I first started out I found Siril and other free alternatives just as confusing. That’s obviously subjective, which is why I always emphasize the “for me” part.

I still use Siril from time to time, especially for the Seestar stacking script, so I’m definitely not looking down on it- it’s a great piece of software. At this point in my astrophotography journey, though, I simply find that a PixInsight workflow fits the way my brain works.

Clear skies everyone!

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Georg N. Nyman avatar

I use PI for serious stacking work - almost always. Siril I like to stacking OSC raw data to see if they are any good at all. APP I use if I want to combine different sessions with differing setups - IMO, it is very easy to do with APP.
Most recently, I started to use SetiAstroSuite Pro because it offers some internal apps, which are useful and intuitive to use.

But if I know what I want to get as a final image, after I have painfully reduced the amount of raw data, I use PI and adjust the parameters to my liking and requirement.

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Gary Thompson avatar

Thanks for this post! I’ve been using Siril for about 3 years now and my images are OSC so this was the motivation I needed to start transitioning over to PI and give it a go!

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Kristof Vandebeek avatar

I switched from Siril to Pixinsight when I switched from color to mono imaging. I found Siril to be too user unfriendly to handle all the aspects that come with multi-night, multi-filter, multi-telescope imaging. Yes, it can be done, but WBPP handles this more easily and less labor intensive.

I must admit though that being a Siril user for a while gave me a better insight in how the stacking process works. I nowadays still use Siril to quickly check simple stacks and to see if I need some additional data to be captured. I also use Siril for lunar wavelet sharpening.

One thing I recently discovered in Siril is its capability to integrate a large amount of calibrated/platesolved subs to a mosaic. This actually gave me better results then Pixinsight. And very nice to know: Siril can read (not write) XISF files, so for my mosaics I calibrate in Pixinsight and do the rest in Siril (until the processing).

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Tony Gondola avatar

I would agree with all that. Siril is and will remain in the toolbox if for no other reason that you can do quick stacks, well, so quickly. I’m so much in the habit of setting up data folders the Siril way that it’s no problem to do that.

I also feel that when going to PI, as with any complex software, it really helps to have a have a good bit of knowledge conerning what tool you need, when and why. With that background you can just learn the interface you can take off from there. That huge list of processes and scripts would be hard to deal with if you didn’t.

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Jeffrey Kieft avatar

Not sure if this is a confession, but I have been using PixInsight for years, really since I started in this hobby. I love it.

I was first exposed to it when I attended a workshop on basic PixInsight use at an OkieTex star party for which I downloaded a free trial. A few months later, having decided I liked the hobby and wanted to dig into it, I bought a full lifetime license. Not too long after, I bought a subscription to some of Adam Block’s online tutorial videos, which have been game changers.

For me, these have been worth every penny. The multitude of constantly updating tools and the flexibility PixInsight affords me is remarkable. I will never outgrow it, and it gives me the ability to try many different ways of achieving the same thing. Having not tried other free tools, I cannot directly compare but I can’t think of anything I can’t do in PI.

Its’s drawbacks? First, a steep learning curve. There is no “set path” of clicks to guide you through processing - you have to put in your homework to learn it. But, I don’t mind because isn’t that the point of a hobby? Second, Related to that, it is really hard to just sit down and teach yourself to use it by intuition. Online tutorials and such are probably essential to get going. Third, it is not free…I think a lifetime license is a few hundred dollars. But, this is a lifetime license, not a subscription, and is a fraction of the cost of a decent imaging rig. To me, that is money well spent if I truly want to pursue this hobby for the next 10-20 years (or more, I hope!).

So, I can only recommend it.

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Morian avatar
Whether you use SIRIL, PI or something else to process your data depends on how good you are at post processing at the end and how many tips and tricks you know.
That's my experience after 8+ years in this hobby.
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Jeffrey Kieft avatar

Morian · Mar 21, 2026, 05:29 PM

Whether you use SIRIL, PI or something else to process your data depends on how good you are at post processing at the end and how many tips and tricks you know.
That's my experience after 8+ years in this hobby.

100% agree.

"It's not the plane, it's the pilot"

- Top Gun: Maverick

😀

Tony Gondola avatar

Morian · Mar 21, 2026, 05:29 PM

Whether you use SIRIL, PI or something else to process your data depends on how good you are at post processing at the end and how many tips and tricks you know.
That's my experience after 8+ years in this hobby.

I think that’s largely true. I’ve been reprocessing some old work (but not too old). PI has made a difference in 2 areas:

Speed and simplicity of processing complex data sets.

The use of BlurX which gives most of the quality boost, mainly with stars. I simply had never found a workflow outside of BlurX that can replicate that.

I’m sure there are other things that I just haven’t used yet but that’s my impression so far.

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Tony Gondola avatar

Jeffrey Kieft · Mar 21, 2026, 05:41 PM

Morian · Mar 21, 2026, 05:29 PM

Whether you use SIRIL, PI or something else to process your data depends on how good you are at post processing at the end and how many tips and tricks you know.
That's my experience after 8+ years in this hobby.

100% agree.

"It's not the plane, it's the pilot"

- Top Gun: Maverick

😀

Maverick might not agree if you put an F-35 up against an F-16…

Jeffrey Kieft avatar

Tony Gondola · Mar 21, 2026, 06:56 PM

Jeffrey Kieft · Mar 21, 2026, 05:41 PM

Morian · Mar 21, 2026, 05:29 PM

Whether you use SIRIL, PI or something else to process your data depends on how good you are at post processing at the end and how many tips and tricks you know.
That's my experience after 8+ years in this hobby.

100% agree.

"It's not the plane, it's the pilot"

- Top Gun: Maverick

😀

Maverick might not agree if you put an F-35 up against an F-16…

Straight into the danger zone

Bill McLaughlin avatar

andrea tasselli · Mar 14, 2026, 01:39 PM

WBPP is NOT the reason for buying PI. Ever.

I agree. In fact, I have been using PI almost since it started and I never use WBPP. I can get to integrated images 80% as fast using just the processes and I hate any ‘“black box” approach to anything in general. I like to see what I am doing at each step.

Tony Gondola avatar

You guys will have to enlighten me because I’m new to PI and WBPP was one of the things I was most impressed with. What’s wrong with using it and what should I really be doing?

andrea tasselli avatar
Producing an astronomical image is down to 6 (or 7) steps:

1. Frame Calibration
2. Frame Cosmetic Correction
3. Frame Weighting
4. Frame Registration
5. Frame Normalization
6. Light Integration (optional: Drizzle Integration)

I'd like to keep track on what happens at EVERY steps should something go wrong and my imaging runs are often messy, full of pitfalls and far from standardized. And WBPP is soooooooooooo slow.
Tony Gondola avatar

So in PI speak, this would be the process lineup?

ImageCalibration

CosmeticCorrection

SubFrameSelector

StarAlignment

LocalNormalization

ImageIntergration

I would agree that WBPP isn’t super fast but it’s light years faster than what I was doing before. I’ve always understood the steps involved but I’ll have to learn a lot more about what’s possible to adjust in each process and why. Not much point if I’m mostly just taking the defaults.

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