Digital BW, The Print

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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