Digital BW, The Print

Hi Clayton,

That's an interesting observation, and I trust your knowledge of 
these things. But, I am nevertheless surprised to hear this. In a 
b/w print from QTR, isn't the printed black tone primarily rendered 
with K, while the other inks simply "enhance" it? Are you saying 
that most of the black rendering is actually created with M, C, and 
Y? You can tell I'm quite new at this...

Thanks,

Jeff
http://pbase.com/k2kv


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Clayton Jones" 
<cj@c...> wrote:
> 
> Hello Jeff,
> 
> >I just recently started using Eboni in my 2200 with the QTR (just 
> >love my QTR)...it is very difficult for me to see any difference, 
> >especially after both have dried thoroughly. 
> > 
> >At first print, I immediately felt that Eboni was a bit 
cooler...but 
> >a couple of days later, when I started swapping some prints 
around, 
> >trying to identify each one, I simply could not tell which was
> which! 
> 
> It may be because there is very little K in the prints.  Depending 
on
> the image and the curves, it's possible that K is only introduced 
in a
> quantity sufficient to tell a difference in the lowest zones.  For
> example, when using UT7 with sliders, I discovered that there is 
no K
> at all until about RGB 5, or about 98%, and it isn't pure K until 
RGB
> 0, maybe 1.  So it's possible that something similar is going on
> there.  It may require a low key image before the difference is
> noticeable.  In BO printing, which is all pure K, there is an
> immediately apparent difference.
> 
> Regards,
> Clayton
> 
> 
> Info on black and white digital printing at    
> http://www.cjcom.net/digiprnarts.htm