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siril siril about current news current docs current faq current tutorials current forum current downloads current shop current search current donate current languages translations english français siril siril is an astronomical image processing tool download siril version 1 4 4 released on june 17 2026 release notes linux appimage linux third party flathub flatpak ️ linux known issues with this version see bug tracker windows 64 bit ucrt64 windows portable ucrt64 windows ️ deprecated mingw64 64 bit mingw64 windows ️ deprecated portable mingw64 windows ️ deprecated macos intel macos apple silicon macos source code if you use siril in your work please cite this software using the following information c richard et al journal of open source software 2024 9 102 7242 doi 10 21105 joss 07242 recent news rc astro tools available in siril 2026 jun 26 by cyril richard siril 1 4 4 2026 jun 17 by cyril richard parallax 2026 jun 14 by cyril richard siril 1 4 3 2026 may 07 by cyril richard calibration remove unwanted signal and pattern from raw images is the main goal of the first step of preprocessing siril can of course deal with biases darks flats master files stacking improve signal to noise ratio by combining many registered individual images outliers rejection will reduce noise even more enhancement the stacked image can be improved before publication by calibrating the colours applying deconvolution stretching histogram and more science because images can contain valuable scientific data siril provides tools to analyze star brightness variation a powerful astrometry interaction will quickly give you information about objects in the image your complete astro workflow it ll blow your mind siril is fully capable to pre process and process astronomic images by offering to the users a large set of dedicated algorithms user can do it automatically using dedicated scripts or manually if he prefers to keep control over each step deep sky lucky imaging processing speed operations see for yourself thanks to the ability to natively process ser videos siril is really adapted to the deep sky lucky imaging technic all algorithms work use all cores of the computer it is then possible to process more than 60 000 frames with no effort adapting the registration method following the case on all stars one star or on the nebulae body makes the alignment nearly never fail even if stars are faint fast and flexible checkmate taking the great advantage of the ser file format or the fits cube only one more file is created for each preprocess step each stacking method runs in parallel in consequence processing 10 000 images can go as fast as drinking a cup of coffee follow us copyright 2026 siril pixls us siril