I've never heard of qtr before, and have became a little excited now that I have.
My need is just one thing, to print solid opaque black on transparent inkjet film. I won't be dealing with halftones or anything, just solid black to block UV light.
I this what QTR can be used for with the printers it works with.
Just in case you are wondering what I'm getting up to, I'm learning to make circuit boards. I've already had success but used a double layer of transparencies to get the opacity, so I'm wanting to get away from that and achieve enough black ink density to use one single sheet.
Cheers,
Keith.