Digital BW, The Print

I don't think there is much difference in EEM and PhotoRag relative
performance with UT and UT7 inks, at least if both ink sets are the current
batches.

If the old UT was pre-November 2004, you may have a batch that had a lot of
magenta in it -- too much for most people.  Also, since the old UT used
magenta pigments and the new does not, there could be more of a difference
between EEM and PR with respect to how they react to the new inks (which are
based in part of R800 blue clone pigment instead of magenta).

There are differences in UT and UT7 inksets that could show up in curves,
depending on how they are written.  The UT toner uses the same mix of color
pigments (ignoring the carbon content) as does the UT7 light cool ink (LM).
The UT7 dark cool ink (M) and light black use a different and less magenta,
more green mix of color pigments.  This is one of the basic changes that was
made, mostly to avoid the excessive magenta shades that ended up in glossy
papers.

So, if the curves put much UT7 LK or M into the mix above 50%, the tone will
be thrown off.  The LM should be the dominant toner used in a neutral print
at 50%.  If you want more magenta below that, you can also extend the LM
curve down into the shadows more.  So, by writing the curves differently,
you can control, within limits, the amount of magenta bias.

By the way, if you use only IJC (or QTR), you might consider putting UT-FS-Y
in the LK spot.  For IJC, I have a 7600 neutral curve that utilizes this for
dotless highlights.  It should easily linearize on the 2200.  I'll try
PhotoRag with this curve and see how it looks soon.

Hope this helps.

Paul
www.PaulRoark.com 


> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of David
> Wroblewski
> Sent: Monday, May 30, 2005 1:32 PM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: [Digital BW] The UT-7 greenies
> 
> I just switched from UT to UT-7 inks, and I'm going
> through a, er, learning phase... meaning I have a lot
> of dumb questions. :-)
> 
> I mainly print on either EEM or H. Photo Rag. Using the
> UT inks, I could basically use the same profile on either
> paper (relinearized, of course) and get a very similar
> result, despite the fact that Photo Rag base is more of a
> cream color than EEM's brilliant white.
> 
> Now, with the UT-7 inks, I just printed a picture on
> Photo Rag, and instead of being more or less the same
> as on EEM, it has a strong greenish cast--very muddy
> looking grays, too, and darn ugly. I thought it looked
> a little off until I set it next to both a UT-7/EEM and
> a UT/Photo Rag, both of which look very nice in comparison.
> 
> I'm using a 2200 with clean nozzle checks + IJC/OPM.
> 
> Now, my questions, for anyone who knows both the
> UT and UT-7's.
> 
> (1) Have you been able to get more or less the same
> hues from either set? Or should my expectation be that
> I've switched to a different "palette", and trying to
> match my old UT prints (or close) is misguided? Obviously,
> the profiles will be different, since the component inks
> are different, but I don't want to get into IJC profile
> tweaking if this ain't possible. (Actually, I have been
> messing with profiles, with zero success.)
> 
> (2) Has anyone seen this dramatic difference between EEM
> and Photo Rag with UT-7?
> 
> -david
> 
> 
> 
> 
> 
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