Siril Image Processing Application
Siril is a free and open source astronomical image processing software for Linux, macOS and Windows. Using this you can improving the signal to noise ratio and noise reduction of RAW image from multiple captures as required in astronomy. It support BIASES/DARKS/FLATS master files and natively process SER videos. You can also stack and enhance pictures from various file formats, even image sequence files like films and SER. It is released under GNU General Public License v3.0.
