I still would like to see some documentation on the ImageMiner extension. Surely there is some somewhere. Do you know where I might find it?
Documentation is a big problem. Some preprocessing operators are documented on wiki
http://rapid-i.com/wiki/index.php?title=Category:Image_extensionSituation about documentation will get better this summer. I hope

By the way, when I looked at MyExperiment to see your workflows, I read about Taverna. I had never heard of that application before. Are you familiar with it? I am curious as to how it is being used.
I also had never heard of Taverna

Best
Vaclav