Digital BW, The Print

>>Your setup uses mostly HP PK, right? I am pretty happy with Eboni on
matte, I was intended to use minimum of HPPK, just to cool down lighter
tones. Could you show DMax and Lab b curve for your setup?

Dmax depends on paper (and batch) - L*=14 - 16 typically.
(in the version I sent Sergei directly -Attached is the ab curve for HPR (51
step))
You'll see that "b" (series 2) stays pretty close (+0.5, -0.2) to paper
white right until the deep shadows (where it hits 1.8 @ 47 out of 51 steps),
where you can't really see colour anyway. I may play around more with the
eboni 18% and keep "b" from falling below paper white at all. But first I
had to develop my own linearization program, because you can't linearize
with QTR once you hand tweak the quad file values, nor can you linearize
over multiple profiles if you blend in as a separate toner.

Mike

On 5 February 2010 19:00, santonov2you <drumscanner@...> wrote:

>
>
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com<DigitalBlackandWhiteThePrint%40yahoogroups.com>,
> Michael King <drmrking@...> wrote:
> > >>K as gray curve produced very weak 100% spot, it had L 12 and 95% spot
> > was 3.2.
> >
> > Ok from my experience with HPPK you have to use very little GLOP (5%)
> with
> > the darker 50% of the tones, or it increases the L* reading.
> > HPPK is very sensitive to GLOP %. I am getting L*<2 with IGFS and Epson
> > Exhib.
>
> Michael, I didn't use glop in the same pass with inks, and I measured
> prints without glop. I believe problem with 100% HP PK relates to my printer
> (2200), when I was printing BO with this ink on 1400, it produced very
> decent DMax and low banding. In my setup I have undiluted HPPK as toner with
> density 100 and UT7 C as Gray ink also with density 100, both inks are at
> default limit, so these two printed together. Somehow paper takes more inks
> this way -- none of two inks can reach DMax that high when used solo.
>
> >You'll get much more neutral result from the following;
> >
> >K - 100% Eboni
> ...
> >LM - 4% HPPK
>
> Your setup uses mostly HP PK, right? I am pretty happy with Eboni on matte,
> I was intended to use minimum of HPPK, just to cool down lighter tones.
> Could you show DMax and Lab b curve for your setup?
>
> --Sergei
>
>  
>


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