Svenesis.orgSvenesis Gradient Analyzer
Version 1.8.4 – GPL-3.0-or-later
✨ Available in the official Siril Script Repository. You can install and launch this script directly from Siril – open Scripts → Get Scripts, search for Svenesis, and tick the checkbox next to this script.
Analyzes background gradients, vignetting, and hardware artifacts in images before processing. Identifies problems, quantifies their severity, and recommends specific corrections.
Features
- 9 specialized visualization tabs: Heatmap, 3D surface, Profiles, Histogram, RGB per channel, Background model, Gradient magnitude, Subtraction preview, FWHM/Eccentricity map
- Over 30 quantitative metrics including gradient strength, direction, and complexity
- Smart tool recommendations (subsky, AutoBGE, GraXpert, VeraLux Nox)
- Before/after comparison for objective improvement measurement
- Calibration checks: missing flats, amp glow, banding, dew/frost detection
- Preset thresholds for broadband, narrowband, and fast optics
- Beginner-friendly explanations throughout
Workflow
Load linear FITS image → start script → analysis (5–30 sec) → check gradient strength display → follow recommendations → apply extraction → re-analyze.
Dependencies
numpy, PyQt6, matplotlib, scipy; optional: astropy