Thanks, Paul... looks like l deleted my original post, but it was in your reply. I was going to reword it before anyone replied but I didn't act quickly enough.
At any rate, I did run a nozzle check, and got a perfect pattern. I'll get working on a new curve per your instructions and also the QTR manual.
What's interesting is that another photograph printed out just fine. It has some shadows too but they were not colorized.
Thanks for your help, as always.
Paul