Digital BW, The Print

On 3/4/03 8:24 AM, "Paul Roark" <paul.roark@...> wrote:

> With respect the issue of achieving a neutral print with the 2200,
> 
> Michael wrote:
> 
>> ... getting neutral B&W varies dramatically from paper to paper
>> and the Premium Luster paper is one of the
>> more difficult to achieve this on.   ...
> 
> Even B&W ("quad") inksets have problems with this.
> 
> In fact, that is one reason why my UC VM 4.3 has turned out to not be the
> final formula.  It was average in this respect.  For example, while vm 4.3
> printed neutral (with a magenta/selenium bias) on EEM/EAM (50% patch, vm
> "nc" curve), it was 2 units warm (meaning Y - C = 0.02) on Premium Luster.
> PiezoTone Selenium ink prints just like VM 4.3 on EEM, but is 2-3 units warm
> on PhotoRag.
> 
> Can one inkset be relatively neutral on more than one paper?  Especially
> when we're talking about both matte and RC papers, it's not a trivial
> problem.  (Consider all the profiling issues and software for the color
> inksets.)
> 
> The good news is that I've been able to mix different pigments and make a
> toner that is much more stable across paper types.  (The UC VM grays will
> remain pure carbon.)  The current UC VM 4.52, at the 50% patch achieves the
> following X-Rite spectrophotometer readings with the standard 1160 vm "nc"
> curve:
> 
> EEM/EAM -         C = 0.65, M = 0.66, Y = 0.65
> 
> UltraSmooth -     C = 0.61, M = 0.61, Y = 0.61
> 
> (I believe Epson UltraSmooth will be the major cotton paper in a year.)
> 
> Premium Luster -     C = 0.60, M = 0.61, Y = 0.60
> 
> Eclipse Satine (with the vm "mw" curve)
> 
> C = 0.56, M = 0.57, Y = 0.56
> 
> PhotoRag -         C = 0.60, M = 0.61, Y = 0.61
> 
> Photo Paper -     C = 0.66, M = 0.67, Y = 0.67.
> 
> 
> 
> So, the issue is definitely not trivial, but combining different pigments
> can achieve an inkset that, even if not perfect, is much more consistent in
> it's tone across various papers.
> 
> The process reminds my of how lenses are made from glasses with different
> refractive indices to correct optical aberrations.  You can offset the
> defects of one with the different defects of another.  (Single-meniscus
> lenses just don't cut it any more.)
> 
> Paul
> http://www.PaulRoark.com
> 
> 
> 
> 
> 
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