Digital BW, The Print

In a message dated 2/10/2003 5:48:01 PM Pacific Standard Time, 
peter@... writes:

> At 12:28 AM 2/10/2003 +0000, DigitalBlackandWhiteThePrint@yahoogroups.com 
> wrote:
> >There have been several reports that the IP5 rip does not use Yellow ink 
> >when Printing greyscale images!
> 
> 
> Cyan+magenta = blue so just subtracting the yellow
> doesn't give you a neutral print.Snip



So that would mean removing any color from the equation would not neutralize 
the print tone? Rememebr the second black ink is  really Brown!  Great 
profiles will get you neutral, but that doesn't help you if you have 
metamerism!!
Ok maybe I was mistaken! Perhaps it was magenta? With two black tones added 
to the mix, God knows how many combinations for neutral there might be. Any 
rate, the reports do shown IP 5 prints seem more neutral
and exhibit much less tone shifting in various lighting conditions. I even 
read someone claim it was only using 3 inks! Eliminating metamerism, by 
pulling back the offending tints(perhaps yellow?) Is a big step toward 
neutral as an added bonus. Its pretty well known only 3 inks are needed for 
continuos tone black and white ink prints.
Awhile back when Whilhelm posted his Ultrachrome Longevity ratings, there was 
some discussion about how the Black and White prints got a 100
year rating when the color prints only got 80years from the same inkset? It 
was speculated that The Gray balancer or IP prints had one of the weaker inks 
pulled back quite abit, or that something was different in the make up of the 
black and white prints.
Who knows who or how the Whilhelm prints where made, we only know the black 
and white prints tested better and there must be a reason for it.
I don't use IP 5 or ultrachrome inks, I just repeat what I think I've read, 
And I do believe IP5  is doing something other than a great profile! Its 
controlling the individual inks and there mix points!
Steve M.


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