Tonight I finally committed support to Gutenprint for the Mitsubishi CP-9810D/DW high-speed kiosk dye-sublimation photo printers. I have no idea if it actually works, but at least Gutenprint appears to be generating properly-formatted output.
What made the CP-9810D/DW printers interesting is that not only did they require 12 bits of data per pixel, but they also required the lamination pattern to be generated on the host and sent over as another image plane.
Next up, I'll move on to the CP-D70DW/D707DW models. These two models also require a host-supplied lamination plane -- and the image data appears to be a full 16bpp.
It may be worth adding more generic lamination pattern support to Gutenprint, just to see what we can do. But for now I'd just be happy with being able to test out all of this new printer support.
On that note, I've lowballed a bid for a Kodak 805 printer (the successor to the 1400 large-format printer), and I'm in contact with someone who picked up a Mitsubishi CP-9550DW and is willing to be a guinea pig. Hey, it's a start..