Svenesis Gradient Analyzer

Version 1.8.4 – GPL-3.0-or-later

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