Digital BW, The Print

Peter,

On the 1160 BO printing does result in a higher dmax than when the driver is
set to "Color" ink printing.  It's just the way the printer and driver were
made.  On the newer printers color/RGB and BO have equal blacks.

The rest of the difference is probably a matter of curves and dots.  

Just like grain gives an impression of sharpness to a traditional print, the
dots of the BO printing can give that same impression.  I prefer a fine
grain film and very sharp image.  However, the perennial popularity of Tri-X
indicates that many like that look.

If you are printing with the UT variable-tone inkset (as opposed to the
UT-FS or FSN), then there is a carbon curve that cuts the blue ink out.
It's quite warm -- warmer than BO because Eboni is a relatively neutral
black ink.  The UT-FS (warm FS) inkset is closer to the BO tone.

The curve or ramp that the BO printing puts on the image may also be
different than the ramp numbers I work to.  I matched the results of my old
Piezo system because I wanted to be able to print the same files with both
systems.  There is no universally accepted definition of what a "linear"
response should be.  You can print a couple 21-step test files and see how
the resulting ramps compare.

A not un-common problem with the 1160 is that the printers varied enough
that the curves made on my old machine may not be quite right for your 1160.
"Canned" profiles have their limits.  Tweaking the control curves (start
with the red curve/cyan ink) is the best way to optimize the inkset.  For
the 1160 and UT-FS/FSN inkset I made what I call a "mild" partitioning curve
that should be less affected by printer differences; yet it is still
essentially dotless.  

Paul
www.PaulRoark.com

___________________________

-----Original Message-----
From: bwbonkers [mailto:PeterDLevis@...] 
Sent: Saturday, August 28, 2004 1:24 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] Re: BO vs PiezoBW ICC

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Antonis" 
<antonisphoto@y...> wrote:
> Peter,
> 
> it seems that you are missing dmax because of how you use the
> inks rather than the inks themselves. If the same inkset gives you
> better results in BO, the problem is the profiles / driver and not
> the ink itself.  A well profiled ink/paper/printer combo will give
> almost the same dmax whether in BO or quad mode. There is
> a slight loss in dmax when other inks have to print along with
> the black, but hardly noticeable to the eye. Certainly not as
> dramatic as you describe.
> 
> I would suggest that rather than chasing after inksets or pre-
packaged
> kits you look into drivers that allow you to control your own 
profiles.
> It's not that complicated, and if you have come this far, wanting
> the same dmax as BO but with quad inksets, you will find it
> perfectly doable.
> 
> To get more specific advice from people here, please let us know
>  your OS,  printer and papers you use (and was that the original 
UT?).
> 
> Antonis
>
Hi Antonis
The inks I'm using are MIS UT ink with Eboni black, in a Epson 1160, 
using Paul Roark UT11 curves. The papers are EAM and PhotoRag. The 
operating system is Mac OS X version 10.3. The Epson print driver is 
the latest from the Epson site. 

What you say is interesting but not quite sure how you would go about 
it. The full ink set prints are printed as per Paul's instructions, 
with his curves put on a layer in PS. I keep the files 16 bit, RGB 
mode. All driver/PS settings are as his instructions. They print just 
fine until you compare them to BO. The full set prints just seem a 
little flat compared to BO. Maybe its the blue ink used in the full 
set ink to control tone thats causing the problem. Now if you know 
what you are doing I guess you could alter PRs curves so blue does'nt 
get used and see what results. However I do not understand how these 
curves work. If you have any ideas I would be more than happy to have 
a go. Certainly experimenting is part of the fun for me. I would love 
to get these inks to print better. I really do not want to buy into 
another system particularly as MIS are such a brillant company.

One last thing as you would expect PhotoRag prints better than EAM 
but then it does BO too!!!

I really cannot see how an amateur such as myself could better PRs 
curves. After all he knows what he's doing I don't.

Peter
> 
> 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "bwbonkers" 
> <PeterDLevis@a...> wrote:
> > Cheap vs Expensive. 
> > 
> > Anyone tried both and can give me some feedback as to how they 
> > compare. 
> > 
> > I thought my full set MIS UT ink prints were good until I tried 
BO 
> > printing. BO has much better dmax, luminance, and pow factor BUT 
I 
> > still do not like the dots. However I like BO better than full 
set 
> > inks. Thats the problem with printing by yourself, you have 
nothing 
> > to compare with. So I am now back on the holy grail. I want a 
print 
> > that has all the luminance of BO but without the dots. Would 
Piezo be 
> > the answer? 
> > 
> > I'll ask the Piezo group too.
> > 
> > Peter




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