A Brand-New Star Removal Script Comes to Siril - Zenith

We are very pleased to announce the release of a brand-new star removal script in Siril, based on an original artificial intelligence model, generously developed by SyQon specifically for the Siril community.

Unlike many existing approaches that rely on encoder–decoder architectures with successive resolution reduction and reconstruction stages, Zenith follows a fundamentally different design philosophy. The model operates largely at native image resolution, significantly reducing spatial information loss.

Instead of reconstructing details after aggressive compression, information is refined progressively, using local and global aggregation mechanisms designed to preserve fine structures and photometric consistency.

This approach enables much more accurate handling of several critical aspects of astrophotography, including:

• stars of very different sizes within the same image,

• halos and low-contrast transitions,

• local artifacts (blobs, residuals) that may appear during reconstruction in other models.

In practice, rather than “rebuilding” the stellar signal from compressed features, Zenith continuously models and suppresses it, resulting in improved spatial coherence and greater visual stability.

A deliberate trade-off: this higher level of accuracy comes at the cost of increased computation time. While some fast models process an image in only a few seconds, Zenith typically takes about twice as long. This is a conscious choice in favor of result quality and reliability.

The model is completely free and available in Siril under the name Zenith. It can be downloaded like all other scripts by clicking on Scripts → Get Scripts. Then, simply search for the word ‘SyQon’.

If you would like to support the team who made this possible, you can contribute via the following link: https://www.paypal.com/donate?campaign_id=C8FTH6CUT6MR4

We warmly thank SyQon for this major contribution to the Siril ecosystem.