About
RegiStax is a long-standing, free image processing tool purpose-built for the amateur and professional astrophotography community. It enables users to process AVI video files or image sequences captured through telescopes, automatically aligning and stacking hundreds or thousands of frames to dramatically reduce atmospheric noise and increase detail. The core workflow involves loading a video or image set, selecting quality frames, aligning them using reference points, stacking the best frames, and then applying RegiStax's signature wavelet sharpening to bring out fine planetary, lunar, or solar detail. RegiStax 6, the final and most refined version, introduced multicore processing support for large AVIs, improved RGB alignment, debayering fixes, and a more stable wavelet engine. The software is particularly well-regarded for its intuitive wavelet panel, which allows users to sharpen detail at multiple spatial scales simultaneously without introducing harsh artifacts. In parallel, the development team released WaveSharp — a modern, standalone successor to the wavelet module — which is actively maintained on CodeBerg and GitHub (versions 1.0 through 3.0 released between 2023 and 2025). RegiStax runs primarily on Windows and has been used under Linux via compatibility layers. It is completely free and has been a cornerstone tool for planetary imagers worldwide for over two decades.
Key Features
- Frame Alignment & Stacking: Automatically aligns and stacks hundreds or thousands of video frames, reducing noise and revealing fine detail in planetary and lunar subjects.
- Wavelet Sharpening: Multi-layer wavelet sharpening lets users enhance detail at different spatial scales independently, producing crisp results without harsh artifacts.
- AVI & Image Sequence Support: Processes large AVI video files and image sequences with multicore CPU support, including extended mode for very large files.
- RGB Alignment & Debayering: Corrects color channel misalignment and supports debayering of raw color camera data for accurate color astrophotography.
- WaveSharp Companion App: A modern standalone wavelet sharpening application (WaveSharp 3.0) that extends RegiStax's core technology with continued active development.
Use Cases
- Stacking hundreds of planetary video frames to reduce atmospheric turbulence and reveal surface detail on Jupiter, Saturn, or Mars.
- Processing high-resolution lunar AVI recordings to produce sharp, detailed images of the Moon's surface features.
- Sharpening solar images captured in H-Alpha or white light to highlight prominences, sunspots, and granulation.
- Applying multi-scale wavelet sharpening to already-stacked astrophotography images as a post-processing step.
- Using WaveSharp as a dedicated wavelet sharpening tool for images processed in other stacking applications.
Pros
- Completely Free: RegiStax and WaveSharp are both available at no cost, making professional-grade astrophotography processing accessible to everyone.
- Proven & Trusted by the Community: Used by amateur and professional astrophotographers worldwide for over 20 years, with extensive tutorials and community support available.
- Powerful Wavelet Engine: The multi-scale wavelet sharpening system is one of the most effective detail-enhancement methods available for planetary imaging.
Cons
- RegiStax 6 No Longer in Active Development: The main RegiStax application received its final update in May 2011, meaning it may not support newer camera formats or modern OS features.
- Windows-Centric: RegiStax is primarily a Windows desktop application; Linux use requires compatibility layers and is not officially supported.
- Steep Learning Curve for Beginners: The wavelet and stacking settings can be overwhelming for newcomers to astrophotography without guidance from tutorials or articles.
Frequently Asked Questions
Is RegiStax free to use?
Yes, RegiStax is completely free. Both RegiStax 6 and the newer WaveSharp application are available for free download with no licensing fees.
What types of images can RegiStax process?
RegiStax is designed for astronomical images, particularly planetary, lunar, and solar subjects captured as AVI video files or image sequences from telescopes.
What is WaveSharp and how does it relate to RegiStax?
WaveSharp is a modern standalone application built on the wavelet sharpening technology from RegiStax 6. It is actively developed and released on CodeBerg and GitHub, with version 3.0 released in December 2025.
Can I use RegiStax on Linux or macOS?
RegiStax is primarily a Windows application. While community articles describe running it under Linux using compatibility layers, it is not officially supported on Linux or macOS.
Is RegiStax still being updated?
RegiStax 6 reached its final update in May 2011. However, the development team continues innovation through WaveSharp, which is actively maintained with new versions released in 2023, 2024, and 2025.
