Digital BW, The Print

Paul, just thinking out loud here... I've never got my hand on a 7000, so I
don't know how the ink carts work, but should it possible to bulk load FS
and print through the cone rip?

Julian
----- Original Message -----
From: "Paul Roark" <paul.roark@...>
To: "DigitalB&WPrint" <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Monday, November 05, 2001 7:01 PM
Subject: RE: [Digital BW] Quad Ink Densities


> Alessandro,
>
> You wrote:
>
> >I suppose that MIS Full Spectrum quads densities are very similar - if
not
> >equal - to Piezo, given that these inks are also known as "Cone clone".
> >Am I right?
>
> They are very close, and they should be the same.  I'd assume they are a
> feasible substitute with at most minor corrections.
>
> To be honest, I haven't actually tried the production FS inks to see why
> some users thing there needs to be a slight correction in the Piezo driver
> dot gain (or whatever it is) box.  I'm wondering if MIS missed the
densities
> slightly.  Given all the density fluctuations with the Piezo and CIS
> combination, it may be that some of that affected the design criteria, but
> I'm guessing.  (I was not involved in finalizing the mixing ratios.) On
the
> other hand, what I've found with the MIS VM system is that some Piezo
> customers got used to their malfunctioning Piezo/CIS systems and thought
the
> distorted g/s ramp was normal. So, they may be "correcting" the system to
> replicate their mal-functioning Piezo/CIS systems.
>
> Basically, though, the big picture is that the MIS VM, FS and Piezo inks
are
> about the same.  I'm trying to establish an open system with competing
inks
> and workflows so that no one company can get a monopoly and stick it to
us.
> B&W photo has always been a technology that is affordable and easy for
> creative types to use and manipulate.  I want to be sure it stays that
way.
> So, if the FS densities aren't right on, I'll get some and see what can be
> done to correct the situation.
>
> I might add that I've detected density differences between batches of inks
> from the same company (both Piezo and MIS). There is no such thing as
total
> accuracy here.
>
> However, one reason we need the ink companies to do our basic ink mixing
is
> that my quick and dirty syringe mixing is not accurate enough to give
> sufficient consistency.  One needs very accurate scales and large volumes
to
> be even close to consistent with some of these critical ratios -- I'm
> talking three digits of accuracy.  The light inks are affected by changes
in
> their mixing ratios to the hundredths of a percent.
>
> > I have a set on its way to my eager hands, and I was planning to
> >measure densities as well, but if you already did it I'd definitely trust
> >your results rather than mine.
>
> Well, you really need to compare, for example, Piezo and the FS inks on
the
> same system with the exact same materials.  The density ratios I put out
> there are what I get for my system.  All systems are a little different.
> So, get the curve, 21-step test file, and print some Piezo (from a cart --
> not an old CIS that may have affected densities) and see what densities
you
> come up with.  Then try the other ink and compare.  Expect + or - 1-2%
just
> from printer variances.  Even high end 7000s and drum scanners don't seem
to
> be more consistent.  Perfection is impossible here.
>
> Paul
> http://www.PaulRoark.com
>
> ___________________________________
>
> Alessandro Pardi
>
> -----Original Message-----
> From: Paul Roark [mailto:paul.roark@...]
> Sent: gioved\ufffd 1 novembre 2001 22.07
> To: DigitalB&WPrint
> Subject: [Digital BW] Quad Ink Densities
>
>
>
> To judge ink densities, I print the 21-step test file using what I call my
> "Color Test" curve.  (The driver settings I use for this include Matte HW
> paper type and No Color Adjustment.) This basically pumps out 100% of each
> ink at a different part of the test strip.  Then I scan the test strip and
> do a levels on it.  So, black is 100% and white is 0% when measured with
the
> eyedropper in Photoshop (if the image is in grayscale mode).
>
> Scanner settings, etc. can affect results, so I use the tool just to
compare
> inks -- and mix new brews.
>
> Piezo gives results as follows: K = 100, C = 84, M = 38, Y = 27%.
>
> <huge snip>
>
>
>
>
> Please visit the Group Homepage to check the Files, Bookmarks, Polls and
other resources as they are often being updated. The page is at:
>
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
>
> Please follow these basic guidelines:
> - Include your full name with your message.
> - Include the address of your website, if you have one.
> - As threads develop, trim off excess portions of earlier messages to keep
them short.
> - As the topic of a thread changes remember to change the subject header.
> - Good manners are required at all time. No personal attacks or "flames."
> - Complete your Yahoo profile.
> - Before posting a question, search the message archives and the various
resources on the homepage.
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>