ImageD11 can also do indexing, using a completely different philosophy from that of GrainSpotter.

The idea is based on the following:

• Select 2 diffraction rings from your sample
• For each pair of peaks (one on each ring)
  • Test whether a grain could have those 2 peaks
  • If so, calculate the corresponding grain orientation.
• For each test orientation, generated above, look for for more peaks that could be assigned to this grain. If a given threshold is reached, accept the grain as a true grain.