if you want to make an animation or gif from the image files ( image to video ) 1. align and crop ( optional ) 2. use ImPPG to align use PIPP to output as animation PIPP setting: PS: PIPP also has center and crop feature, but it doesn't work for me.Only roughly 3 in 4 images are aligned properly ImPPG download PIPP download alternatives: - ImageMagick instead of PIPP using free / trial softwares: - : MATLAB + 'minboundcircle' written by John D'Errico, github Which is in turn using convex hull - OpenCV + Lucas-Kande method (optical flow), using eg python - 互相关 + FFT in numPy R + astrolib using paid softwares: PixInsight, FFT registration script