Digital BW, The Print

Should this new Epson colorbase linearization dramaticly improve the
9800's ability to print more accurate cmyk proofs of files put
together by illustrators or designers for offset reproduction? In
other words, eliminate the need for a post script driver created for
that purpose?

John



--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale
<stevekale@b...> wrote:
> I can view the "target" by opening the .txt reference file in
Colorlab and
> see its patches.  (The 4800 Mac download is completely screwed up and
> doesn't work.  Epson Support are on to it.)  As for Rolf, I have been
> reading his posts and he seems a little confused (or is at least
confusing).
> See his latest. Greg/Ernst, I would agree from viewing the test
chart that
> it is not doing an RGB profile but rather (a form of) CMYK linearisation
> which I would label part of "calibration" and not "profiling".  I don't
> "get" Rolf's split of these.  (Pity they don't give us control over ink
> limits as well !!) 
> 
> Arguably it is using 66 patches per colour (C, M, Y and K) with the
scale
> for 2 of them comprising two inks and 3 inks for K.  However, I do
not know
> if this is how the underlying CMYK driver thinks. 66 observations is
quite a
> number.
> 
> 
> > From: Ernst Dinkla <E.Dinkla@c...>
> > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > Date: Tue, 04 Oct 2005 16:35:33 +0200
> > To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > Subject: Re: [Digital BW] Re: more colorbase misc. - printing target
> > 
> > Steve Kale wrote:
> >> You may still have to print from the utility (contrary to my
earlier post)
> >> and hence a separate edited tiff might not work.  I can't see if
the tiff is
> >> printed by Colorbase as a CMYK file (a la QTR Calibration) or as
an RGB file
> >> through the driver.  To be doing linearisation it needs to be
doing the
> >> former.  A straight colour scale with just C/c, M/m, Y or K/k/kk
per patch
> >> respectively.
> > 
> > Target is CMYK, 8 rows of patches, 33 patches per row = 264.
> > The GRAD file next to it has 8 lists that say C,LC. M, LM etc.
> > It will print the target with Colorbase. The split to the 8
> > channels will be based on the CMK percentages in the target, Y
> > isn't split.
> > 
> > an excerpt from the Colorsync list:
> > 
> > Well, a simple look at the reference data lets me draw the
> > conclusion that
> > this is more a linearisation tool than a calibration tool.
> > 
> > The patches in there look like cyan, magenta, yellow and grey
> > patches.
> > Just not enough colors to build a lookup-table.
> > 
> > Rolf