The Paid Softwares
These are the workhorses that serious deepsky imagers rely on. They cost a little cash, but man, do they let you pull every last photon out of your file.
1. PixInsight (The Precision Tool)
Payment Model: Permanent License, OneTime Purchase
Current Cost (Approx.): $275 (USD)
PixInsight is the undisputed king of deepsky processing Period. This software was built from the ground up for our hobby, and it treats your data with surgical, mathematical precision. It’s what I use for processing my images calibrating your frames, stacking them perfectly, and performing advanced functions like Deconvolution which is the secret sauce for getting that razor sharp detail in your nebula or galaxy. While the learning curve is steep, for that onetime payment, you get a lifetime license for the current major version, and the processing power is simply unmatched. There are also some plugins for example starxterminator and blurxterminator(both are paid licenses) If you want the absolute best results, this is where you end up.
2. Adobe Photoshop (The Finishing School)
Payment Model: Subscription (Monthly)
Current Cost (Approx.): ~$19.99 USD/Month (Photography Plan)
Photoshop isn’t built for stacking images of the Veil Nebula, but it’s the industry standard for everything that comes after the heavy lifting. Once you’ve got your stacked and preprocessed file, you bring it here to polish it up. This is an ongoing monthly subscription, but the Creative Cloud Photography plan gives you a suite of tools that are unbeatable for Layerbased Editing, Masking, and running incredible Plugins (like the fantastic AI powered RC-Astro tools). This is where you bring your image to life and give it that final, pro look.
The free Softwares
Don’t have the cash for the paid options yet? No problem! These free tools are getting better all the time and can deliver absolutely stunning results.
1. Deep sky stacker (Free stacking software)
Deep Sky Stacker (DSS) is the best tool to have if you are starting out or you want a strong, zero-cost package for your first stacking. It’s a fantastic free and opensource program that can handle the crucial first part of your processing pipeline, from calibration and registration to the final stacking. DSS is equipped with powerful, automatic features such as its Recommended Settings and Automatic Star Detection, which greatly simplify the intricate process of aligning and combining hundreds of images. On top of that, you can utilize excellent algorithms such as various stacking methods (e.g., Kappa-Sigma Clipping) right in the program to efficiently lower the noise and get rid of the artifacts. It is neat, it is quick, and it is a real tool that achieves the highest quality initial integration for you.
2. Siril (The All-In-One Starter)
If you’re just starting out or want a powerful, zero cost all in one package, Siril is your friend. It’s a fantastic free and opensource program that can handle your full processing pipeline, from calibration and stacking to initial stretching. It has powerful, automatic features like its Photometric Color Calibration (PCC), which snaps your colors into place based on the true colors of stars. Plus, you can run great algorithms like StarNet++ right inside it to completely remove your stars. It’s clean, it’s fast, and it’s a legitimate tool that gets you 90% of the way there.
3. GIMP (The Free Photoshop)
GIMP (GNU Image Manipulation Program) is the free alternative to Photoshop. If you’re stacking in Siril or DeepSkyStacker and need a place to do your final, detailed artistic work without a subscription, this is where you go. Like Photoshop, it’s layerbased, which is key for advanced editing. You can use it to finetune your curves, do targeted noise reduction, and use powerful masking techniques to enhance specific parts of your image. You’ll need to put in some time to learn it, but the results you can achieve for free make this hobby accessible to everyone!