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Digital BW, The Print

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Re: [Digital BW] Re: Paul's Recommended BW Workspace

2006-03-14 by Steve Gledhill

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
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Please visit the Group Homepage to check the Files, and other 
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> >
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> >
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> Please visit the Group Homepage to check the Files, and other 
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> If you wish to receive no emails or just a daily digest, or you wish 
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> Please follow these basic guidelines:
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> B&W printing. Users who persistently make off-topic posts may be 
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