Our workflow is very different than regular QTR workflow practiced by non-Piezography users. Piezography is actually incompatible with regular QTR workflow.
Piezography uses a very precise Gamma 2.20 workflow and is especially sensitive on Mac OS X (post 10.4). Any deviation from our instructions disrupts the linearization. And on Mac OSX, any deviation may result in your images being converted prior to printing. So, make sure that you are following our workflow to get the best results. Let us know if you have further questions.