This image will then be used as a working basis for final processing in Photoshop. In astrophotography, the goal of preprocessing is to create an image with as few defects as possible (noise, optical defects…) from a series of identical images. But be careful, you must use it sparingly otherwise you will get an image that is too smooth and too artificial (the software is able to “invent” details).
Topaz Denoise AI ($ 80) (Windows, Mac): an extremely efficient software for noise reduction, but also to gain in resolution. It does the same as Sequator, but on Mac! Starry Landscape Stacker (Mac) ($ 40). Sequator (Windows): this excellent little free software has many features but above all it can stack a series of identical shots by separating the Milky Way (which moves because the Earth rotates) and the ground (which remains fixed) even if you are not equipped with an equatorial mount. Unlike others it is capable to fill the “holes” between the trails caused by the time interval between two consecutive shots. 
Star Stax (Windows, Mac): this software allows you to stack your star trails. Very powerful, but with a complex handling, it is to be reserved to advanced and passionate users. 
ASTROPHOTOGRAPHY STACKING SOFTWARE MAC TRIAL
Pixinsight (€ 230, free trial version) (Windows, Mac, Linux): if you you are interested in astrophotography, you probably have heard of this software. Photoshop is not free but there is no as effective alternative yet… It asks patience to be mastered but you will find many Internet resources. Photoshop (€ 11.99 / month with Lightroom) (Windows, Mac): the essential software to process your images.
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