Digital BW, The Print

From: "peter nelson" <peter@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Tuesday, February 11, 2003 3:19 AM
Subject: Re: [Digital BW] Digest Number 1297


> At 03:12 PM 2/10/2003 +0000, DigitalBlackandWhiteThePrint@yahoogroups.com
> wrote:
> >Someone else mentioned (so it must be
> >true) that some driver/RIP didn't use one of the magentas in order to
> >reduce metamerism.
>
>
> Someone else suggested that they didn't use YELLOW,
> which makes no sense because there's only one yellow
> so if you don't use it you get cyan+magenta which = BLUE!
>
> Anyway your comment illustrates EXACTLY what I was talking
> about before on this topic, which is that the whole topic of black
> and white digital printing is swimming in rumors and speculation
> and B.S. and alchemy and snake oil, and I want to know when
> the all the BS is going to evaporate and we're going to get our feet
> on solid ground on this topic!
>
> It doesn't take Albert Einstein to examine some IP prints under
> a loupe (or simply scan them in with a hi-rez flatbed) so we
> can KNOW what colors it's using, and stop speculating!
> This isn't rocket science, guys.  I've got plenty of scans from
> my printers, including my 2200 at 2880 DPI)  on my website,
> so it's not exactly hard.

It must have been a year ago that Andrew Rodney wrote  that there isn't any
yellow used in a B&W print made with IP on a 7600/2200 etc.
It was already clear that the black and grey of the UC inks is quite yellow.
So you only need blue to get near neutral. The forerunner to UC is the
Archival inkset of 10000 CF, 2000p etc. That ink showed a lot of metamerism.
Reports on the colorsync list said that it could be reduced by a heavy black
generation and profiles that shifted the yellow. The yellows of the Archival
and the UC sets differ in hue. So it may not be EXACTLY but it is very clear
that the yellow plays an important role in metamerism. If you hope to get a
simple reason why some things work in inkjet and others don't, you will be
disappointed.

Ernst