Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, CDTobie@... wrote:
>
> 
> In a message dated 12/18/06 10:58:50 AM, j.h.j.h@... writes:
> 
> 
> > One way or another I suspected this. But what is then the absolute
> > measure to be used in comparing results from different measurement
> > setups, L* or density? I assume density, since L is a relative
measure.
> > Right? If so, if someone makes a claim in L-values, it should be noted
> > what system (s)he uses.
> > 
> 
> No, L* is absolute... its density that is often expressed in
relative terms.
> 

Density is often specified in the measured value, or minus paper, so
there it is already relative to something. That's why I usually just
use L*a*b* values to represent things like this. Lab value should be
able to be traced back to the BACRA tiles used for accuracy testing,
and are listed in the measurement device's specification.