Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Tyler 
Boley" <tyler@t...> wrote:
> Antonis, I hope Roy answers, but maybe I can clarify a touch. 
This 
> relates to the last build I have, I believe there is a new build in 
the 
> works.

The last version used PS curve design only.  The new one
can still do that, but I expect most will use the auto curve
generation.

> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, 
"Antonis Ricos" <
> antonisphoto@y...> wrote:
> > Roy,
> > 
> > thanks for all the details. A couple more q's: 
> > 
> > - Is it possible to do UnderColor Removal at the highest 
densities? (i.e. if you 
> > wanted only the black ink there and not (as much) of the 
others?). Since you 
> > don't control individual ink curves, it would seem not 
possible.
> 
> Actually you do have control of the individual inks, all you want, 
> obviously including undercolor. You design your curves in 
Photoshop, 
> output them properly, and then you select which one you want 
in the 
> driver when printing.

It's possible to create all the curves totally by hand with PS
and do absolutely anything you want.  But the part I've been
describing is for the automatic partitioning -- here there's
less control because you don't get to / have to deal with the
underlying curves.

However, the UCR is something I've dealt with somewhat.
By default I was planning on the darkest patch being 100%
black without any other ink.  That seems the best on my 7500.
I have the possibility of including some percentage of the
next darker ink but I'm not sure if that's desirable or not.

>  
> > - Since the partitioning assumes all grays and a black, how 
can one play with 
> > toners (or is it possible at all?).
> 
> The version I tried does not assume that, Roy included some 
MIS 
> variable tone curves with the download. Pretty much anything is 
> possible. The only limitation (correct me Roy) is that more 
complex 
> multiple channel curves may be a problem because PS raw 
maxes at 4 with 
> CMYK.

The one or two toner inks can also be partitioned and the
composite controlled by a curve.  I have a feeling people
will want to customize this overall curve.

If you are in the "do everything yourself" situation, since PS
allows only CMYK in one file, you can just do two files one
for the dark inks and one for the light inks.  You merge all
the curves later on.

>  
> > Sorry to be asking you all these questions, but I haven't had 
the time to play 
> > too much with OS X and/or install the QT RIP, so I am trying 
to get an 
> > overview.
> > 
> > In terms of dithering choices, did you just pick one of the 
gimp dithers, or is 
> > there a drop down somewhere for the end-user to play?
> 
> All of the normal Gimp options including dither are available, 
the 
> basic Gimp driver is still intact.

Yes, all the builtin questions are still there. 

> Tyler

Thanks, Tyler.

Roy