Digital BW, The Print

Thanks for the info Ernst - the more approaches talked about the better or
the lists get dominated by too few brand names!

Julian
----- Original Message -----
From: "Ernst Dinkla" <E.Dinkla@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Monday, December 30, 2002 4:36 PM
Subject: Re: [Digital BW] Colorbyte and Ink questions


>
> ----- Original Message -----
> From: "Julian Thomas" <julianthomas@...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Monday, December 30, 2002 2:47 PM
> Subject: Re: [Digital BW] Colorbyte and Ink questions
>
>
> > This is one of the big plusses of the Posterprint RIP. First you
linearise
> > the RIP for each inkset, then you can tweak the black laydown, then you
> > profile for each paper/ink combo. So you get a driver that doesn't
> compress
> > tonal values and then optimum black flow and then profiles to much the
ink
> > to the paper. A major difference between this and IP IMO - you never
wait
> > for 'support' for an inkset - you just calibrate and go.
> >
> > Julian
>
> It is a big plus of many RIPs. On the other hand it isn't so easy to make
> CMYK printer profiles. "RGB" printer profiles are far easier to make. The
> Wasatch SoftRip allows the user the usual linearisation (calibration in
> fact) per printer/inkset + inklimitation + setting for the Cc/Mm
breakpoint.
> On top of that you can build CMYK printer profiles that incorporate the
> Black Generation percentage and the kind of BG. You need a good profile
> generator then.
>
> With version 4.5 there is a choice added to use the printer as an "RGB"
> machine, still with the basic calibration aspects but with an extra,
> separate Black Generation setting that allows you to use "RGB" printer
> profiles instead.
> They actually added that to profile the more complex CcMmYKOG printers.
With
> their normal CMYK channel profile structure it wasn't easy to get the best
> from those machines. Another approach would have been to make multiple
> channel profiles and a colourengine that can handle that. Profile creation
> software for that kind of colour management will be much more expensive.
As
> I understand it they are also working on that together with Monaco.
>
> For B&W, good calibration and the use of curves in the driver itself
should
> be an advantage. The Wasatch SoftRip has the last as well. Still not
enough
> experience with that however. I have ordered the last upgrade and that
> allows me some extra support. I wonder whether they could make a
monochrome
> linearisation for quad and hexatone inksets. A menu structure that allows
> the user to set the quad channels from light to dark and a single greystep
> for measuring. The measured results can then be translated in curves for
the
> individual channels. I guess that for a VM set two greysteps for measuring
> would be needed. A CcMmYK printer is  linearised as a CMYK printer so in
the
> calibration curves you will see the usual breakpoint where c goes to C.
> Something similar will then be seen in the single calibration curve for a
> quad while the individual channels will have odd curves.
>
> Ernst
>
>
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