- Export the file as .tiff from Lightroom (Ctrl-Click, Export).
- Open QTRGUI.
- Go to Options and make sure Autoprint is off (it is on by default).
- Drag and drop your image into the small rectangle on the top right of the GUI.
These instructions are also in The Piezography Manual that comes with the curve archive that you can download here: Piezography Community Edition | Piezography
best,
Walker