Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Louis Dina" 
<lou@...> wrote:
>
> I see a lot of paper manufacturers talk about whiteness and opacity 
> when describing their papers.  I always think in Lab terms when 
> thinking of the brightness and color of the paper (and wish they'd 
> provide that data).
> 
> For example, the data sheet for Innova Cold Press specifies a 
whiteness 
> of 88.32%.  Is there any correlation between "whiteness" and Lab 
> numbers?  Can I determine or estimate the Lab values from their 
> whiteness value?
> 
> Also, what does the opacity number mean?  The above paper specifies 
an 
> opacity of 98.95%.
> 
> Thanks,
> 
> Lou
>

Hmmm..........I may have partially answered my own question.  Looks 
like everyone has their own system, and brightness and whiteness 
don't necessarily correlate to Lab measurements.  Here's a Xerox 
article on the subject which clarified things a little, but didn't 
provide the answer I was hoping for.

http://a1851.g.akamaitech.net/f/1851/2996/24h/cacheB.xerox.com/downloa
ds/usa/en/t/ThreeKeyPaperPropertiesWhitePaper.pdf

Lou