PyFAI is an azimuthal integration library that tries to be fast (as fast as C
and even more using OpenCL and GPU).
It is based on histogramming of the 2theta/Q positions of each (center of)
pixel weighted by the intensity of each pixel, but parallel version use a
Neighboring output bins get also a contribution of pixels next to the border
thanks to pixel splitting.
Finally pyFAI provides also tools to calibrate the experimental setup using Debye-Scherrer
rings of a reference compound.