Re: Using a Spectrolino for density measurements
Re: Using a Spectrolino for density measurements
- Subject: Re: Using a Spectrolino for density measurements
- From: Phil Green <email@hidden>
- Date: Thu, 27 Feb 2003 10:36:31 +0000
- Organization: LCP
Robert Castles wrote:
>
3.) Lastly, I also heard a rumor from someone that there is an equation that
>
can be used to calculate density from Lab values. Does anyone know of such
>
an equation and of its accuracy.
You can calculate colorimetric densities if you have the XYZ
tristimulus values (set the measurement software to get this, or it's
a simple calculation if you just have CIELAB values). The Dg density
is a correlate of visual density. There is an example of the
calculation in the density.xls spreadsheet at
http://www.digitalcolour.org/understanding/Density.htm, but all you
need to do is log(Tn/T) where T is a tristimulus value X, Y or Z and
Tn is the tristimulus value of the reference white (100 for absolute
measurement of density, or the T of the substrate for density above
substrate).
--
Phil Green
Colour Imaging Group
LCP
Elephant and Castle, London SE1 6SB
Tel: +44 020 7514 6759 Fax: +44 020 7514 6772
http://www.digitalcolour.org
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