Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" 
<paul.roark@...> wrote:
>
> I've been trying various approaches to QTR profiling to try to 
figure out
> what gives the best results with the least work.  I've posted my 
notes from
> a carbon curve I made that reflect my latest thoughts on procedure, 
for what
> it's worth.  
> 
> See http://home1.gte.net/res09aij/QTR_2200_4K+_MBW-Carb-w7.pdf 
> 


Hi Paul,

Thanks for your continuing effort to bring B&W printing forward! 
Looking forward to see where this route will lead to. 

Two questions though. First of all, what would be your expectation on 
the complexity to adapt the Cyan and Magenta toner curves for each 
and every paper? Since two months I'm working with the UT3D set and 
find it actually quite simple to create a new curve, including 
getting the tonality right. But I fully realize that is because you 
have done already most the work in the formulations of the inks! The 
curve creation seems quite a bit more complex with this inkset 
approach, especially if the toner curves vary wildly for different 
papers. Or do you expect that, once the basic approach has 
cristalized, this approach is suitable for ordinary human beings ;-)

Secondly, a detail question: why don't you convert the file prior to 
printing to the Gray-LAB space (=QTR space) instead of correcting the 
Gamma 2.2 profile with a PS curve? I tend to edit leave the image in 
RGB (with a color channel mixer layer as a non-destructive RGB2gray 
conversion). For printing purposes I flatten the file and convert to 
Gray-LAB and save as separate print file. Using the gray-lab profile 
is what I understood to be the preferred workflow, but you choose 
differently apparently. I'm curious to learn the background.

Joost