Some praise for RawTherapee features by Mark Metternich

Theoretically correct, but most printer drivers derive their start point from the ppi resolution value.

If sending to an Epson printer, the initial output resolution from the likes of Lightrooms print module needs to be set to 360 or 720 to avoid possible artifacts in the print. In other words, the final print head resolution needs to be equally divisible by the initial output resolution - again, something else that a lot of people get wrong.