SPD stands for SPatial Distortion. Written in C language, this command-line driven program deals with images coming from X-ray diffusion/diffraction experiments. It does subsequently: *intensity corrections (dark current, flat field correction, ...), *geometry corrections using spline files or a pair of distortion arrays, *azimuthal integration in 2D or 1D after maskin defective pixels. SPD was originally written by Jorg Klora for ESRF and was re-written by Peter Boesecke. Maintenance and packaging of the program are provided by Rainer Wilcke and Jerome Kieffer from software group at ESRF.