Hi John,
You know my thoughts on PI. One thing though amongst all the great stuff it does, is that one is very restricted by output format. Everything goes via Surfer and this cost bucks. ImageJ on the other hand does similar stuff and is free. I am thinking of the bulk of my users who have no access to surfer. Most work is currently done by me when in one of my more benevolent moods, and sometimes this can take a while to get out of the way when other demands are high. You are right...we could buy another licence. But maybe PI could be updated to allow for alternative output formats other than surfer?
Cheers,
Malc.