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Siril 1.2.6, released by Free-Astro, is an open-source image-processing application dedicated to the needs of amateur astronomers who want to turn raw sequences of DSLR or CCD frames into polished, science-grade results. Designed for deep-sky, planetary, and wide-field imaging alike, the program provides a complete pipeline that begins with automated calibration (dark, flat, bias) and alignment and ends with advanced stacking, photometry, and color-space manipulation. Its 32-bit floating-point engine preserves faint nebulosity and stellar profiles while offering wavelet-based sharpening, deconvolution, and gradient-removal tools that rival those found in far more expensive packages. A built-in script editor lets users repeat complex workflows on multiple nights of data, and batch converters handle FITS, RAW, and SER formats so that cameras from Canon, Nikon, ZWO, QHY, and others are supported out of the box. Because Siril is lightweight and command-line driven, it runs efficiently on modest Windows laptops at the telescope as well as on multicore desktops for later refinement. The project has matured through three major public versions—each expanding native star-detection algorithms, comet-registration modes, and live-stacking previews—making it equally useful for quick field checks or long-term variable-star monitoring. Siril is available for free on get.nero.com, with downloads delivered through trusted Windows package sources such as winget that always supply the latest build and support batch installation alongside other applications.
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