Saving for Success: Exporting Your Astrophotography Images the Right Way

Introduction

You’ve completed the processing, balanced the colour, teased out the faintest details, and the image is finally where you want it. The last stage is just as important as everything before it – exporting your work correctly so that what you see on your screen is exactly what others see in print or online.

1️⃣ Save Your Project

Before doing anything else, save your PixInsight project in its native format (.xisf). This keeps all your process history, masks, previews and makes it easy to revisit or rework the image later without losing any steps.

2️⃣ Assign the Right Colour Profile

Colour consistency is critical, especially when moving images between software or preparing them for print.

• Open AssignICCProfile and set it to sRGB for web and general use.
• For high-end printing, you can use AdobeRGB or a printer-specific ICC profile, but sRGB is the safest default if you’re unsure.
• Keep rendering intent on Perceptual and enable black point compensation to preserve subtle tonal detail.

3️⃣ Prepare for Print

If the image is heading for paper:

• Go to Process → Resample, set the resolution to 300 dpi, tick Force resolution, and apply.
• This doesn’t change the actual pixel dimensions – it just tells printers how to interpret the file size for best quality output.

If you plan to enlarge the image, do it now before saving the final master.

4️⃣ Choose the Right File Format

Different formats serve different purposes. A good habit is to save in more than one.

• XISF – Your master file with full history, layers and metadata.
• 16-bit TIFF – The standard for printing and further editing in Photoshop or Affinity. It preserves the most colour and detail without compression.
• JPEG (100% quality) – Best for online sharing and quick previews. Always embed the colour profile.
• PNG – A good alternative for the web, though some hosts strip colour profiles, so always check.

💡 Tip: If you’re planning to continue editing in Photoshop, 16‑bit TIFF in sRGB is the safest choice. 32‑bit files can look strange when opened outside PixInsight unless you convert them first.

5️⃣ Maintain Colour Accuracy

Use a calibrated monitor if you can, especially if the image is destined for print. Colours can shift subtly between devices, and a calibrated workflow helps ensure what you see is what you get.

6️⃣ Quick Export Checklist

• Save .xisf master file with all history.
• Assign and embed an ICC profile (sRGB by default).
• Resample to 300 dpi if preparing for print.
• Export in at least two formats: 16‑bit TIFF for archival and print, JPEG or PNG for sharing.
• Double‑check the exported file on another device to confirm colour and contrast.

🎬 Conclusion

This is the final step in the PixInsight workflow and the point where your image leaves the safety of the processing environment. Getting the export right ensures all the hard work you’ve put in survives beyond your own screen – whether that’s on a wall, in print, or shared online.

With this, you’ve now completed the full in‑PixInsight deep‑sky workflow. The next stage, if you choose, is taking the image into external tools for final polishing – but even without that, you now have a correctly prepared, high‑quality master to be proud of.