Digital BW, The Print

Antara,

>On MIS website, I don't see that UT is available for the 870.

They must have the empty carts.  I wrote the VM curves for the 870 & 1270 on
a 870 -- filling empty carts from MIS with bulk VM ink.  So, it just means
you'll have to fill the carts.

>re the curves- I have used the curves for 1270 and 870 (my 1270
>died recently). So I assume I could use the 1280 curves for 870.

The 1280 curves would work -- but work well only if you use the 1280 (or
equivalent letter-size printer) driver.

>Do you know what the dmax is for EEM, UT and 1270/870?

Eboni will hit about 1.66-7 most of the time.

>Higher, I assume than the C82.

Yes.

>Didn't understand your explanation of EEM .01 warm and cool.

The spectrophotometer I have measures densities to 0.01 -- in each of the
cyan, magenta, and yellow channels, as well as a "visual" reading.  Neutral
is when c=m=y.  The "selenium" tone is when M is 0.01 above C&Y.  Cool tone
is when C exceeds Y. Warm is when Y exceeds C.  You can see a 0.01
difference in side-by-side comparisons.

So, I use these spectrophotometer readings to mix the inksets and make the
curves.  It's the most accurate way I know of to do this.

Hope this helps.

Paul
http://www.PaulRoark.com
___________________________________________

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul
Roark" <paul.roark@v...> wrote:
> Antara,
>
> >I have 870 with MIS VM, using Roark curves.. Am considering
the
> >C82 after all the excitement here.
> >How would you compare the two?
>
> The 870 may be the better printer.  The UT inks, however, are
better than
> the VM inks in terms of longevity (and tones, in my view).  So, if
the UT
> inkset ran well with the curves and in your printer, there would
not be much
> reason to change.
>
> The C82 is part of an effort to have a very affordable and easy
archival B&W
> printing solution -- for anyone.  For what it is and costs, it's
doing a
> very good job.  I'm putting the finishing touches on a neutral
inkset now.
>
> The weaknesses of the C82 are, first, that its dmax is a bit low.
With the
> neutral inkset I'm seeing 1.58-9 on EEM and 1.59-60 on
PhotoRag.
>
> Second, of course, is that it, like the 870, cannot print larger
than
> letter-size paper.
>
> Third, like all monotone inksets, the tones cannot be fine-tuned
in the same
> way the vm & UT inksets can.  And, of course, there is not
ability to do
> split-tone printing.
>
> In the neutral inkset for the C82 I've compromised the neutral
tone as
> follows:  EEM is 0.01 cool, and PhotoRag is 0.01 warm at 50%.
>
> On the other hand, the C82 has a unique trick here.  If the
warm (UT light
> C) ink is put in the yellow spot, EEM is then 0.01 units warm.  If
a warm
> ink cart is put in the magenta spot, EEM is then 0.04 units
warm.  To switch
> between these, in fact, I just swapped the yellow and magenta
position
> carts -- they are all interchangeable.  So, with 2 inks, much
more fine
> tuning is possible on the C82 than on most monotone inksets.
>
> The forth weakness or quirk of the C82 is that the head often
nicks the
> bottom 3/16 inch of the paper.  So, there is sometimes if not
often a little
> ink on the bottom right corner.
>
> I don't know how well the existing curves work on the 870 for
the UT inks.
> For PC users with 1270s the 1280 driver seems to work.  That
way they can
> use the 1280 UT curves.  If that approach works for the 870
and you, then it
> might be worth trying a UT cart.
>
> >Also, is it possible to do the same or similar with the C80. ...
>
> I don't know.
>
> Paul
> http://www.PaulRoark.com



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