Digital BW, The Print

I have tried your formula and the calculator on the link with two
values (one under 8 and another above). The results are the same.
Thank you very much to both Steve for those informations .
Christophe






--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Gledhill
<stephengledhill@...> wrote:
>
> I use this link for my conversion of L* to Density. And other 
> conversions too. BUT, I've never actually checked it out - rather I've 
> taken it on trust. Does anyone else use it and is it ok - please? I 
> could check Steve K's calc against Bruce Lindbloom's - but it's bedtime 
> (very early start tomorrow), so good night all.
> http://www.brucelindbloom.com/index.html?CompandCalculator.html
> Steve Gledhill ----- http://www.virtuallygrey.co.uk/
> 
> Steve Kale wrote:
> 
> > Christophe
> >
> > L* can easily be converted to density. I have a simple spreadsheet
with
> > these formulae:
> >
> > If L* > 8 then XYZ_Y = ((L* + 16)/116)^3 else XYZ_Y = (L* x 27)/24389
> >
> > Density = -log10(XYZ_Y)
> >
> > Steve
> >
> >
> > > From: bwdigiprint <bwdigiprint@...>
> > > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > > Date: Tue, 14 Mar 2006 12:42:23 -0000
> > > To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > > Subject: [Digital BW] Re: Paul's Recommended BW Workspace
> > >
> > > --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Peter De Smidt
> > > <pdesmidt@> wrote:
> > >>
> > >> So with all of the good info presented by Paul and others, I
made my
> > >> first grayscale ICC today. I printed Paul's 21 step stepwedge (with
> > >> 2.20 max density, as that's what I get with my R2400 and EPSM). I
> > >> noticed that the profile embedded with the file is grayscale 2.2. I
> > >> have been using Dot Gain 20%, as I've heard that it leads to more
> > > 'open'
> > >> lower print values. I didn't color manage the stepwedge. (That
was the
> > >> right thing to do, right?) Should I change my working space to
2.2 when
> > >> I use the ICC?
> > >>
> > >> BTW I used my MacBeth 914 reflection densitometer and coverted the
> > >> visual density to L* via a formula.
> > >>
> > > Hello,
> > > I want to purchase an eye one spectrophotometer to make profiles for
> > > my printer but I wondered whether I can also read a density
value fron
> > > that device (I need it to read target for alternative process like
> > > platinum printing). I find on www that there was not correlation
> > > between density and the L* chanel. You' d understand my interest for
> > > your formula!
> > > Thanks for reply
> > > Christophe
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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