Originally posted by Kobayashi.K Which program do you use for stacking?
I use Hugin and it is a mix of the GUI and command line programs that come with it. My general process for stacking non astro shots is:
1. Develop in RawTherapee upscaling by 2x using nearest neighbor method to 16bpc tiffs
2. load the tiffs in the hugin GUI
3. through trial and error find the control point picker and alignment that produces the best results
4. in the GUI do the equalize birghtness option
5. In the output screen have Hugin output remapped aligned files but not actually stitch them
6. Use the hugin_stacker program to combine all the aligned remapped files into one. there are several modes so I will usually combine them multiple ways and pick the best to minimize movement artefacts in the scene, options for combining are average, median, sigma, winsor, min, and max. The sigma, winsor, and median have the outlier rejection capability so they can eliminate ghosting from things moving across the frame from shot to shot.
I do this for very few images as it it time consuming and requires that the shot allow that kind of multiple shots, but for those rare cases where I do need to up the resolution beyond the 24mp of the K-3 it is an option available.