Oh, I did not see that. I think I might be able to find a theoretical solution without modifying gaussian now coming to think of it. Probably won’t look good as a gaussian version of it with smooth interpolation between stretched and non-stretched pixel. I can use the distance away from center to determine value between 1 and 0. Then use convolve_fft. At center it is 1, and when the distance threshold is reached, it is 0.