QTR-Quadtone RIP

I've been wondering about these same issues. Right now I have my 
grayscale working space set to "QTR - Gray Lab" in Photoshop. For 
large prints where I want to maintain absolute control, I will resize 
and sharpen in PS, then save to TIFF with that profile embedded and 
then print from QTR. 

But sometimes I would like to be able to take advantage of the 
interpolation/layout/sharpening in QImage for convenience with 
smaller or less critical prints, by printing to file to create the 
TIFF for QTR. I guess I have the following options:

1) Set QImage to use qtr-rgb-lab.icc as the printer ICC.
2) Set QImage to use qtr-rgb-matte.icc (or qtr-rgb-photo.icc)
3) Set QImage to use the rgb version of a profile created from my 
custom curve and Eye One Photo.

Am I correct in thinking that option (1) will give identical results 
to printing the original file directly in QTR? Would one of the other 
two options give me better results? Also, what exactly is the 
difference between the matte/photo profiles? After all if the paper 
curves have been tweaked for good linearity I wouldn't think you need 
additional compensation in the profile for matte papers.
 
> QTR does not look at the embedded profile in the tiff file -- 
whether it comes from
> PS or Qimage.  It just uses whatever the actual gray values are.  
However when you
> select QTR - RGB Matte Paper in Qimage this is a conversion from 
the source profile
> GG 2.2 to the print profile.  This means all the values are re-
calculated.   The main
> area of difference is the shadows so that explains why your two 
prints are different.
> 
> I would think that the best screen match would be to use 1440dpi 
(or super) and
> print using Qimage and QTR - RGB Matte Paper printing profile.   
There's not much
> difference with soft-proofing since it's just gray.   PS does allow 
a soft-proof with
> Simulate Ink Black which will show the lower dMax if you use the 
Matte Paper profile.
> 
> Roy
>