pyFAI: Fast Azimuthal Integration in Python. pyFAI is an azimuthal integration library that tries to be fast (as fast as C and even more using OpenCL) It is based on histogramming of the 2theta/Q position of each (center of) pixel weighted by the intensity of each pixel. Neighboring output bins get also a contribution of pixels next to the border. (Source: https://www.projet-plume.org/en/relier/pyfai)