QTR-Quadtone RIP

Here's a version of the null-transform that does seem to work for Piezography, (which is concerned only with maintaining the 2.2 gamma, and not any colors) courtesy of Jon Cone:


(I had tried converting to sRGB this weekend, but whatever I chose for a printer profile was not accepted. I did not try Wide Gamut, and that's what worked.)

So: 

1) work in Gray Gamma 2.2;
2) convert image to sRGB;
3) choose "Photoshop manages colors"
4) choose "Wide Gamut RGB" as the printer profile

all else as usual.

I ran a couple of prints this morning testing this, and eye-balling the output (compared to known good test prints done thru CS5) it looks correct, and as expected.