Regim is a software tool for processing astronomical images. Regim is not meant to replace complex image processing systems like Adobe Photoshop or others. It is meant as an addition to them. It makes some processing steps that are unique to astronomical images a bit easier. These steps are calibration (dark and flat), deblooming, registration, combination, color calibration, gradient removal and some more. Regim is free and may be used in unchanged form. However if you find it useful please feel free to make a small donation.