Never mind. Got it, I am slow this AM
--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Shilesh Jani"
<shileshjani@b...> wrote:
>
> Thank you. What if A6<8? As in your EPSG?
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale
> <stevekale@b...> wrote:
> >
> > Luminance (the Y in XYZ) = IF(A6>7.9996248, ((A6+16)/116)^3,
> (A6*27)/24389)
> >
> >
> > Where A6 is Lab L*. Then
> >
> > Density = -LOG10(Luminance)
> >
> >
> > > From: Shilesh Jani <shileshjani@b...>
> > > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > > Date: Thu, 12 Jan 2006 16:01:28 -0000
> > > To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > > Subject: [Digital BW] Convert LAB to Density Was: QuadTone RIP
> vs Epson inks
> > >
> > > What is the formula for converting LAB values to density? My
puny
> > > mind is incapable of thinking in "L".
> > >
> > > --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale
> > > <stevekale@b...> wrote:
> > >>
> > >> I have heard that dye has likely been reintroduced with the K3
> > > inks,
> > >> possibly into the resin that encapsulates the pigment. If I
> were
> > > Epson I'd
> > >> neither confirm nor deny this however and so we are unlikely
to
> > > ever really
> > >> know for sure. The MK ink, however, is the same from K2 to
K3
> and
> > > so this
> > >> speculation would not apply to MK.
> > >>
> > >> BTW I have been playing around with the Nanochromes. Dmax on
> HPR
> > > is Lab
> > >> 10.5, 1.3, -1.6. The same (black) ink on EPSG has Lab
figures
> of
> > > 5.3, 1.5,
> > >> -3.5. Epson Archival Matte paper has "normal" performance
with
> > > 14.8, 1.4,
> > >> 0.4. Of course we know nothing about longevity yet but if
> > > it's "ok" in that
> > >> respect then this could make a very nice universal black ink
if
> > > nothing
> > >> else. No bronzing at all that I can see so far on EPSG but I
> have
> > > a lot
> > >> more testing to do (I can't see any bronzing in the 918
target
> and
> > > the
> > >> finish to the inks is very nice). So far I have just been
> making
> > > ICC
> > >> profiles for EAM, HPR and EPSG and also looking at the
results
> of
> > > printing
> > >> the QTR Calibration Chart, all on my 2100. The figures quoted
> > > above are
> > >> from the calibration page printed at 100% ink limit and
reading
> > > the 55%, 40%
> > >> and 80% patches, ie in creating a QTR curve one would likely
> limit
> > > K on HPR
> > >> to at least 55%. If I recall correctly, this is a lot lower
> than
> > > what I
> > >> used to use with the MIS UCs or Epson Ucs - I guess that would
> > > save some
> > >> ink. LK is quite cool - 100% ink has Lab figures of 28.9,
> 0.3, -
> > > 5.7 (55%
> > >> ink patch has 39.2, 0.2, -5.7). It's late here and I'll type
up
> > > more of my
> > >> preliminary work tomorrow and post profiles for those
interested
> > > in gamut.
> > >> I must say though, a density of 1.92 on HPR looks very nice.
> > >>
> > >>
> > >>> From: Paul Roark <paul.roark@v...>
> > >>> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > >>> Date: Wed, 11 Jan 2006 15:05:42 -0800
> > >>> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > >>> Subject: RE: [Digital BW] Re: QuadTone RIP vs Epson inks
> > >>>
> > >>>> The Epson matte black has a dye component, ...
> > >>>
> > >>> I don't think this is correct. Do you have an Epson source
for
> > > this?
> > >>>
> > >>> I've fade tested the UC MK, and it is very good -- right up
> > > there with
> > >>> Eboni. The "hybrid" Epson blacks according to how they
react
> in
> > > my fade
> > >>> tests are the Durabrite and "Archival" black inks.
> > >>>
> > >>> Paul
> > >>> www.PaulRoark.com
> > >>
> > >
> > >
> > >
> > >
> > >
> > >
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> > >
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