I have so many old photos ruined with star trails. I did a bit of looking around on the web, which helped me realise how to crudely remove these. I took an extreme picture of some trails, de-trailed it and it revealed itself as M42, the Orion nebula. Basically, I just clone an image in Paint Shop Pro 7, and translate one by the amount from the start of the trail to the end using 'Canvas Size'. Then I do 'Image Arithmetic' using Darkest. It doesn't work well when background 'noise' or lots of stars are clustered, but it sorted out a doubled picture of Comet Schwassmann-Wachmann 3 Fragment C, when it flew past a couple of years ago.
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